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#! /usr/bin/env python3 '''SMTP/ESMTP client class. This should follow RFC 821 (SMTP), RFC 1869 (ESMTP), RFC 2554 (SMTP Authentication) and RFC 2487 (Secure SMTP over TLS). Notes: Please remember, when doing ESMTP, that the names of the SMTP service extensions are NOT the same thing as the option keywords for the RCPT and MAIL commands! Example: >>> import smtplib >>> s=smtplib.SMTP("localhost") >>> print(s.help()) This is Sendmail version 8.8.4 Topics: HELO EHLO MAIL RCPT DATA RSET NOOP QUIT HELP VRFY EXPN VERB ETRN DSN For more info use "HELP <topic>". To report bugs in the implementation send email to sendmail-bugs@sendmail.org. For local information send email to Postmaster at your site. End of HELP info >>> s.putcmd("vrfy","someone@here") >>> s.getreply() (250, "Somebody OverHere <somebody@here.my.org>") >>> s.quit() ''' # Author: The Dragon De Monsyne <dragondm@integral.org> # ESMTP support, test code and doc fixes added by # Eric S. Raymond <esr@thyrsus.com> # Better RFC 821 compliance (MAIL and RCPT, and CRLF in data) # by Carey Evans <c.evans@clear.net.nz>, for picky mail servers. # RFC 2554 (authentication) support by Gerhard Haering <gerhard@bigfoot.de>. # # This was modified from the Python 1.5 library HTTP lib. import socket import io import re import email.utils import email.message import email.generator import base64 import hmac import copy import datetime import sys from email.base64mime import body_encode as encode_base64 __all__ = ["SMTPException", "SMTPNotSupportedError", "SMTPServerDisconnected", "SMTPResponseException", "SMTPSenderRefused", "SMTPRecipientsRefused", "SMTPDataError", "SMTPConnectError", "SMTPHeloError", "SMTPAuthenticationError", "quoteaddr", "quotedata", "SMTP"] SMTP_PORT = 25 SMTP_SSL_PORT = 465 CRLF = "\r\n" bCRLF = b"\r\n" _MAXLINE = 8192 # more than 8 times larger than RFC 821, 4.5.3 _MAXCHALLENGE = 5 # Maximum number of AUTH challenges sent OLDSTYLE_AUTH = re.compile(r"auth=(.*)", re.I) # Exception classes used by this module. class SMTPException(OSError): """Base class for all exceptions raised by this module.""" class SMTPNotSupportedError(SMTPException): """The command or option is not supported by the SMTP server. This exception is raised when an attempt is made to run a command or a command with an option which is not supported by the server. """ class SMTPServerDisconnected(SMTPException): """Not connected to any SMTP server. This exception is raised when the server unexpectedly disconnects, or when an attempt is made to use the SMTP instance before connecting it to a server. """ class SMTPResponseException(SMTPException): """Base class for all exceptions that include an SMTP error code. These exceptions are generated in some instances when the SMTP server returns an error code. The error code is stored in the `smtp_code' attribute of the error, and the `smtp_error' attribute is set to the error message. """ def __init__(self, code, msg): self.smtp_code = code self.smtp_error = msg self.args = (code, msg) class SMTPSenderRefused(SMTPResponseException): """Sender address refused. In addition to the attributes set by on all SMTPResponseException exceptions, this sets `sender' to the string that the SMTP refused. """ def __init__(self, code, msg, sender): self.smtp_code = code self.smtp_error = msg self.sender = sender self.args = (code, msg, sender) class SMTPRecipientsRefused(SMTPException): """All recipient addresses refused. The errors for each recipient are accessible through the attribute 'recipients', which is a dictionary of exactly the same sort as SMTP.sendmail() returns. """ def __init__(self, recipients): self.recipients = recipients self.args = (recipients,) class SMTPDataError(SMTPResponseException): """The SMTP server didn't accept the data.""" class SMTPConnectError(SMTPResponseException): """Error during connection establishment.""" class SMTPHeloError(SMTPResponseException): """The server refused our HELO reply.""" class SMTPAuthenticationError(SMTPResponseException): """Authentication error. Most probably the server didn't accept the username/password combination provided. """ def quoteaddr(addrstring): """Quote a subset of the email addresses defined by RFC 821. Should be able to handle anything email.utils.parseaddr can handle. """ displayname, addr = email.utils.parseaddr(addrstring) if (displayname, addr) == ('', ''): # parseaddr couldn't parse it, use it as is and hope for the best. if addrstring.strip().startswith('<'): return addrstring return "<%s>" % addrstring return "<%s>" % addr def _addr_only(addrstring): displayname, addr = email.utils.parseaddr(addrstring) if (displayname, addr) == ('', ''): # parseaddr couldn't parse it, so use it as is. return addrstring return addr # Legacy method kept for backward compatibility. def quotedata(data): """Quote data for email. Double leading '.', and change Unix newline '\\n', or Mac '\\r' into internet CRLF end-of-line. """ return re.sub(r'(?m)^\.', '..', re.sub(r'(?:\r\n|\n|\r(?!\n))', CRLF, data)) def _quote_periods(bindata): return re.sub(br'(?m)^\.', b'..', bindata) def _fix_eols(data): return re.sub(r'(?:\r\n|\n|\r(?!\n))', CRLF, data) try: import ssl except ImportError: _have_ssl = False else: _have_ssl = True class SMTP: """This class manages a connection to an SMTP or ESMTP server. SMTP Objects: SMTP objects have the following attributes: helo_resp This is the message given by the server in response to the most recent HELO command. ehlo_resp This is the message given by the server in response to the most recent EHLO command. This is usually multiline. does_esmtp This is a True value _after you do an EHLO command_, if the server supports ESMTP. esmtp_features This is a dictionary, which, if the server supports ESMTP, will _after you do an EHLO command_, contain the names of the SMTP service extensions this server supports, and their parameters (if any). Note, all extension names are mapped to lower case in the dictionary. See each method's docstrings for details. In general, there is a method of the same name to perform each SMTP command. There is also a method called 'sendmail' that will do an entire mail transaction. """ debuglevel = 0 sock = None file = None helo_resp = None ehlo_msg = "ehlo" ehlo_resp = None does_esmtp = False default_port = SMTP_PORT def __init__(self, host='', port=0, local_hostname=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT, source_address=None): """Initialize a new instance. If specified, `host` is the name of the remote host to which to connect. If specified, `port` specifies the port to which to connect. By default, smtplib.SMTP_PORT is used. If a host is specified the connect method is called, and if it returns anything other than a success code an SMTPConnectError is raised. If specified, `local_hostname` is used as the FQDN of the local host in the HELO/EHLO command. Otherwise, the local hostname is found using socket.getfqdn(). The `source_address` parameter takes a 2-tuple (host, port) for the socket to bind to as its source address before connecting. If the host is '' and port is 0, the OS default behavior will be used. """ self._host = host self.timeout = timeout self.esmtp_features = {} self.command_encoding = 'ascii' self.source_address = source_address self._auth_challenge_count = 0 if host: (code, msg) = self.connect(host, port) if code != 220: self.close() raise SMTPConnectError(code, msg) if local_hostname is not None: self.local_hostname = local_hostname else: # RFC 2821 says we should use the fqdn in the EHLO/HELO verb, and # if that can't be calculated, that we should use a domain literal # instead (essentially an encoded IP address like [A.B.C.D]). fqdn = socket.getfqdn() if '.' in fqdn: self.local_hostname = fqdn else: # We can't find an fqdn hostname, so use a domain literal addr = '127.0.0.1' try: addr = socket.gethostbyname(socket.gethostname()) except socket.gaierror: pass self.local_hostname = '[%s]' % addr def __enter__(self): return self def __exit__(self, *args): try: code, message = self.docmd("QUIT") if code != 221: raise SMTPResponseException(code, message) except SMTPServerDisconnected: pass finally: self.close() def set_debuglevel(self, debuglevel): """Set the debug output level. A non-false value results in debug messages for connection and for all messages sent to and received from the server. """ self.debuglevel = debuglevel def _print_debug(self, *args): if self.debuglevel > 1: print(datetime.datetime.now().time(), *args, file=sys.stderr) else: print(*args, file=sys.stderr) def _get_socket(self, host, port, timeout): # This makes it simpler for SMTP_SSL to use the SMTP connect code # and just alter the socket connection bit. if timeout is not None and not timeout: raise ValueError('Non-blocking socket (timeout=0) is not supported') if self.debuglevel > 0: self._print_debug('connect: to', (host, port), self.source_address) return socket.create_connection((host, port), timeout, self.source_address) def connect(self, host='localhost', port=0, source_address=None): """Connect to a host on a given port. If the hostname ends with a colon (`:') followed by a number, and there is no port specified, that suffix will be stripped off and the number interpreted as the port number to use. Note: This method is automatically invoked by __init__, if a host is specified during instantiation. """ if source_address: self.source_address = source_address if not port and (host.find(':') == host.rfind(':')): i = host.rfind(':') if i >= 0: host, port = host[:i], host[i + 1:] try: port = int(port) except ValueError: raise OSError("nonnumeric port") if not port: port = self.default_port sys.audit("smtplib.connect", self, host, port) self.sock = self._get_socket(host, port, self.timeout) self.file = None (code, msg) = self.getreply() if self.debuglevel > 0: self._print_debug('connect:', repr(msg)) return (code, msg) def send(self, s): """Send `s' to the server.""" if self.debuglevel > 0: self._print_debug('send:', repr(s)) if self.sock: if isinstance(s, str): # send is used by the 'data' command, where command_encoding # should not be used, but 'data' needs to convert the string to # binary itself anyway, so that's not a problem. s = s.encode(self.command_encoding) sys.audit("smtplib.send", self, s) try: self.sock.sendall(s) except OSError: self.close() raise SMTPServerDisconnected('Server not connected') else: raise SMTPServerDisconnected('please run connect() first') def putcmd(self, cmd, args=""): """Send a command to the server.""" if args == "": s = cmd else: s = f'{cmd} {args}' if '\r' in s or '\n' in s: s = s.replace('\n', '\\n').replace('\r', '\\r') raise ValueError( f'command and arguments contain prohibited newline characters: {s}' ) self.send(f'{s}{CRLF}') def getreply(self): """Get a reply from the server. Returns a tuple consisting of: - server response code (e.g. '250', or such, if all goes well) Note: returns -1 if it can't read response code. - server response string corresponding to response code (multiline responses are converted to a single, multiline string). Raises SMTPServerDisconnected if end-of-file is reached. """ resp = [] if self.file is None: self.file = self.sock.makefile('rb') while 1: try: line = self.file.readline(_MAXLINE + 1) except OSError as e: self.close() raise SMTPServerDisconnected("Connection unexpectedly closed: " + str(e)) if not line: self.close() raise SMTPServerDisconnected("Connection unexpectedly closed") if self.debuglevel > 0: self._print_debug('reply:', repr(line)) if len(line) > _MAXLINE: self.close() raise SMTPResponseException(500, "Line too long.") resp.append(line[4:].strip(b' \t\r\n')) code = line[:3] # Check that the error code is syntactically correct. # Don't attempt to read a continuation line if it is broken. try: errcode = int(code) except ValueError: errcode = -1 break # Check if multiline response. if line[3:4] != b"-": break errmsg = b"\n".join(resp) if self.debuglevel > 0: self._print_debug('reply: retcode (%s); Msg: %a' % (errcode, errmsg)) return errcode, errmsg def docmd(self, cmd, args=""): """Send a command, and return its response code.""" self.putcmd(cmd, args) return self.getreply() # std smtp commands def helo(self, name=''): """SMTP 'helo' command. Hostname to send for this command defaults to the FQDN of the local host. """ self.putcmd("helo", name or self.local_hostname) (code, msg) = self.getreply() self.helo_resp = msg return (code, msg) def ehlo(self, name=''): """ SMTP 'ehlo' command. Hostname to send for this command defaults to the FQDN of the local host. """ self.esmtp_features = {} self.putcmd(self.ehlo_msg, name or self.local_hostname) (code, msg) = self.getreply() # According to RFC1869 some (badly written) # MTA's will disconnect on an ehlo. Toss an exception if # that happens -ddm if code == -1 and len(msg) == 0: self.close() raise SMTPServerDisconnected("Server not connected") self.ehlo_resp = msg if code != 250: return (code, msg) self.does_esmtp = True #parse the ehlo response -ddm assert isinstance(self.ehlo_resp, bytes), repr(self.ehlo_resp) resp = self.ehlo_resp.decode("latin-1").split('\n') del resp[0] for each in resp: # To be able to communicate with as many SMTP servers as possible, # we have to take the old-style auth advertisement into account, # because: # 1) Else our SMTP feature parser gets confused. # 2) There are some servers that only advertise the auth methods we # support using the old style. auth_match = OLDSTYLE_AUTH.match(each) if auth_match: # This doesn't remove duplicates, but that's no problem self.esmtp_features["auth"] = self.esmtp_features.get("auth", "") \ + " " + auth_match.groups(0)[0] continue # RFC 1869 requires a space between ehlo keyword and parameters. # It's actually stricter, in that only spaces are allowed between # parameters, but were not going to check for that here. Note # that the space isn't present if there are no parameters. m = re.match(r'(?P<feature>[A-Za-z0-9][A-Za-z0-9\-]*) ?', each) if m: feature = m.group("feature").lower() params = m.string[m.end("feature"):].strip() if feature == "auth": self.esmtp_features[feature] = self.esmtp_features.get(feature, "") \ + " " + params else: self.esmtp_features[feature] = params return (code, msg) def has_extn(self, opt): """Does the server support a given SMTP service extension?""" return opt.lower() in self.esmtp_features def help(self, args=''): """SMTP 'help' command. Returns help text from server.""" self.putcmd("help", args) return self.getreply()[1] def rset(self): """SMTP 'rset' command -- resets session.""" self.command_encoding = 'ascii' return self.docmd("rset") def _rset(self): """Internal 'rset' command which ignores any SMTPServerDisconnected error. Used internally in the library, since the server disconnected error should appear to the application when the *next* command is issued, if we are doing an internal "safety" reset. """ try: self.rset() except SMTPServerDisconnected: pass def noop(self): """SMTP 'noop' command -- doesn't do anything :>""" return self.docmd("noop") def mail(self, sender, options=()): """SMTP 'mail' command -- begins mail xfer session. This method may raise the following exceptions: SMTPNotSupportedError The options parameter includes 'SMTPUTF8' but the SMTPUTF8 extension is not supported by the server. """ optionlist = '' if options and self.does_esmtp: if any(x.lower()=='smtputf8' for x in options): if self.has_extn('smtputf8'): self.command_encoding = 'utf-8' else: raise SMTPNotSupportedError( 'SMTPUTF8 not supported by server') optionlist = ' ' + ' '.join(options) self.putcmd("mail", "from:%s%s" % (quoteaddr(sender), optionlist)) return self.getreply() def rcpt(self, recip, options=()): """SMTP 'rcpt' command -- indicates 1 recipient for this mail.""" optionlist = '' if options and self.does_esmtp: optionlist = ' ' + ' '.join(options) self.putcmd("rcpt", "to:%s%s" % (quoteaddr(recip), optionlist)) return self.getreply() def data(self, msg): """SMTP 'DATA' command -- sends message data to server. Automatically quotes lines beginning with a period per rfc821. Raises SMTPDataError if there is an unexpected reply to the DATA command; the return value from this method is the final response code received when the all data is sent. If msg is a string, lone '\\r' and '\\n' characters are converted to '\\r\\n' characters. If msg is bytes, it is transmitted as is. """ self.putcmd("data") (code, repl) = self.getreply() if self.debuglevel > 0: self._print_debug('data:', (code, repl)) if code != 354: raise SMTPDataError(code, repl) else: if isinstance(msg, str): msg = _fix_eols(msg).encode('ascii') q = _quote_periods(msg) if q[-2:] != bCRLF: q = q + bCRLF q = q + b"." + bCRLF self.send(q) (code, msg) = self.getreply() if self.debuglevel > 0: self._print_debug('data:', (code, msg)) return (code, msg) def verify(self, address): """SMTP 'verify' command -- checks for address validity.""" self.putcmd("vrfy", _addr_only(address)) return self.getreply() # a.k.a. vrfy = verify def expn(self, address): """SMTP 'expn' command -- expands a mailing list.""" self.putcmd("expn", _addr_only(address)) return self.getreply() # some useful methods def ehlo_or_helo_if_needed(self): """Call self.ehlo() and/or self.helo() if needed. If there has been no previous EHLO or HELO command this session, this method tries ESMTP EHLO first. This method may raise the following exceptions: SMTPHeloError The server didn't reply properly to the helo greeting. """ if self.helo_resp is None and self.ehlo_resp is None: if not (200 <= self.ehlo()[0] <= 299): (code, resp) = self.helo() if not (200 <= code <= 299): raise SMTPHeloError(code, resp) def auth(self, mechanism, authobject, *, initial_response_ok=True): """Authentication command - requires response processing. 'mechanism' specifies which authentication mechanism is to be used - the valid values are those listed in the 'auth' element of 'esmtp_features'. 'authobject' must be a callable object taking a single argument: data = authobject(challenge) It will be called to process the server's challenge response; the challenge argument it is passed will be a bytes. It should return an ASCII string that will be base64 encoded and sent to the server. Keyword arguments: - initial_response_ok: Allow sending the RFC 4954 initial-response to the AUTH command, if the authentication methods supports it. """ # RFC 4954 allows auth methods to provide an initial response. Not all # methods support it. By definition, if they return something other # than None when challenge is None, then they do. See issue #15014. mechanism = mechanism.upper() initial_response = (authobject() if initial_response_ok else None) if initial_response is not None: response = encode_base64(initial_response.encode('ascii'), eol='') (code, resp) = self.docmd("AUTH", mechanism + " " + response) self._auth_challenge_count = 1 else: (code, resp) = self.docmd("AUTH", mechanism) self._auth_challenge_count = 0 # If server responds with a challenge, send the response. while code == 334: self._auth_challenge_count += 1 challenge = base64.decodebytes(resp) response = encode_base64( authobject(challenge).encode('ascii'), eol='') (code, resp) = self.docmd(response) # If server keeps sending challenges, something is wrong. if self._auth_challenge_count > _MAXCHALLENGE: raise SMTPException( "Server AUTH mechanism infinite loop. Last response: " + repr((code, resp)) ) if code in (235, 503): return (code, resp) raise SMTPAuthenticationError(code, resp) def auth_cram_md5(self, challenge=None): """ Authobject to use with CRAM-MD5 authentication. Requires self.user and self.password to be set.""" # CRAM-MD5 does not support initial-response. if challenge is None: return None return self.user + " " + hmac.HMAC( self.password.encode('ascii'), challenge, 'md5').hexdigest() def auth_plain(self, challenge=None): """ Authobject to use with PLAIN authentication. Requires self.user and self.password to be set.""" return "\0%s\0%s" % (self.user, self.password) def auth_login(self, challenge=None): """ Authobject to use with LOGIN authentication. Requires self.user and self.password to be set.""" if challenge is None or self._auth_challenge_count < 2: return self.user else: return self.password def login(self, user, password, *, initial_response_ok=True): """Log in on an SMTP server that requires authentication. The arguments are: - user: The user name to authenticate with. - password: The password for the authentication. Keyword arguments: - initial_response_ok: Allow sending the RFC 4954 initial-response to the AUTH command, if the authentication methods supports it. If there has been no previous EHLO or HELO command this session, this method tries ESMTP EHLO first. This method will return normally if the authentication was successful. This method may raise the following exceptions: SMTPHeloError The server didn't reply properly to the helo greeting. SMTPAuthenticationError The server didn't accept the username/ password combination. SMTPNotSupportedError The AUTH command is not supported by the server. SMTPException No suitable authentication method was found. """ self.ehlo_or_helo_if_needed() if not self.has_extn("auth"): raise SMTPNotSupportedError( "SMTP AUTH extension not supported by server.") # Authentication methods the server claims to support advertised_authlist = self.esmtp_features["auth"].split() # Authentication methods we can handle in our preferred order: preferred_auths = ['CRAM-MD5', 'PLAIN', 'LOGIN'] # We try the supported authentications in our preferred order, if # the server supports them. authlist = [auth for auth in preferred_auths if auth in advertised_authlist] if not authlist: raise SMTPException("No suitable authentication method found.") # Some servers advertise authentication methods they don't really # support, so if authentication fails, we continue until we've tried # all methods. self.user, self.password = user, password for authmethod in authlist: method_name = 'auth_' + authmethod.lower().replace('-', '_') try: (code, resp) = self.auth( authmethod, getattr(self, method_name), initial_response_ok=initial_response_ok) # 235 == 'Authentication successful' # 503 == 'Error: already authenticated' if code in (235, 503): return (code, resp) except SMTPAuthenticationError as e: last_exception = e # We could not login successfully. Return result of last attempt. raise last_exception def starttls(self, *, context=None): """Puts the connection to the SMTP server into TLS mode. If there has been no previous EHLO or HELO command this session, this method tries ESMTP EHLO first. If the server supports TLS, this will encrypt the rest of the SMTP session. If you provide the context parameter, the identity of the SMTP server and client can be checked. This, however, depends on whether the socket module really checks the certificates. This method may raise the following exceptions: SMTPHeloError The server didn't reply properly to the helo greeting. """ self.ehlo_or_helo_if_needed() if not self.has_extn("starttls"): raise SMTPNotSupportedError( "STARTTLS extension not supported by server.") (resp, reply) = self.docmd("STARTTLS") if resp == 220: if not _have_ssl: raise RuntimeError("No SSL support included in this Python") if context is None: context = ssl._create_stdlib_context() self.sock = context.wrap_socket(self.sock, server_hostname=self._host) self.file = None # RFC 3207: # The client MUST discard any knowledge obtained from # the server, such as the list of SMTP service extensions, # which was not obtained from the TLS negotiation itself. self.helo_resp = None self.ehlo_resp = None self.esmtp_features = {} self.does_esmtp = False else: # RFC 3207: # 501 Syntax error (no parameters allowed) # 454 TLS not available due to temporary reason raise SMTPResponseException(resp, reply) return (resp, reply) def sendmail(self, from_addr, to_addrs, msg, mail_options=(), rcpt_options=()): """This command performs an entire mail transaction. The arguments are: - from_addr : The address sending this mail. - to_addrs : A list of addresses to send this mail to. A bare string will be treated as a list with 1 address. - msg : The message to send. - mail_options : List of ESMTP options (such as 8bitmime) for the mail command. - rcpt_options : List of ESMTP options (such as DSN commands) for all the rcpt commands. msg may be a string containing characters in the ASCII range, or a byte string. A string is encoded to bytes using the ascii codec, and lone \\r and \\n characters are converted to \\r\\n characters. If there has been no previous EHLO or HELO command this session, this method tries ESMTP EHLO first. If the server does ESMTP, message size and each of the specified options will be passed to it. If EHLO fails, HELO will be tried and ESMTP options suppressed. This method will return normally if the mail is accepted for at least one recipient. It returns a dictionary, with one entry for each recipient that was refused. Each entry contains a tuple of the SMTP error code and the accompanying error message sent by the server. This method may raise the following exceptions: SMTPHeloError The server didn't reply properly to the helo greeting. SMTPRecipientsRefused The server rejected ALL recipients (no mail was sent). SMTPSenderRefused The server didn't accept the from_addr. SMTPDataError The server replied with an unexpected error code (other than a refusal of a recipient). SMTPNotSupportedError The mail_options parameter includes 'SMTPUTF8' but the SMTPUTF8 extension is not supported by the server. Note: the connection will be open even after an exception is raised. Example: >>> import smtplib >>> s=smtplib.SMTP("localhost") >>> tolist=["one@one.org","two@two.org","three@three.org","four@four.org"] >>> msg = '''\\ ... From: Me@my.org ... Subject: testin'... ... ... This is a test ''' >>> s.sendmail("me@my.org",tolist,msg) { "three@three.org" : ( 550 ,"User unknown" ) } >>> s.quit() In the above example, the message was accepted for delivery to three of the four addresses, and one was rejected, with the error code 550. If all addresses are accepted, then the method will return an empty dictionary. """ self.ehlo_or_helo_if_needed() esmtp_opts = [] if isinstance(msg, str): msg = _fix_eols(msg).encode('ascii') if self.does_esmtp: if self.has_extn('size'): esmtp_opts.append("size=%d" % len(msg)) for option in mail_options: esmtp_opts.append(option) (code, resp) = self.mail(from_addr, esmtp_opts) if code != 250: if code == 421: self.close() else: self._rset() raise SMTPSenderRefused(code, resp, from_addr) senderrs = {} if isinstance(to_addrs, str): to_addrs = [to_addrs] for each in to_addrs: (code, resp) = self.rcpt(each, rcpt_options) if (code != 250) and (code != 251): senderrs[each] = (code, resp) if code == 421: self.close() raise SMTPRecipientsRefused(senderrs) if len(senderrs) == len(to_addrs): # the server refused all our recipients self._rset() raise SMTPRecipientsRefused(senderrs) (code, resp) = self.data(msg) if code != 250: if code == 421: self.close() else: self._rset() raise SMTPDataError(code, resp) #if we got here then somebody got our mail return senderrs def send_message(self, msg, from_addr=None, to_addrs=None, mail_options=(), rcpt_options=()): """Converts message to a bytestring and passes it to sendmail. The arguments are as for sendmail, except that msg is an email.message.Message object. If from_addr is None or to_addrs is None, these arguments are taken from the headers of the Message as described in RFC 2822 (a ValueError is raised if there is more than one set of 'Resent-' headers). Regardless of the values of from_addr and to_addr, any Bcc field (or Resent-Bcc field, when the Message is a resent) of the Message object won't be transmitted. The Message object is then serialized using email.generator.BytesGenerator and sendmail is called to transmit the message. If the sender or any of the recipient addresses contain non-ASCII and the server advertises the SMTPUTF8 capability, the policy is cloned with utf8 set to True for the serialization, and SMTPUTF8 and BODY=8BITMIME are asserted on the send. If the server does not support SMTPUTF8, an SMTPNotSupported error is raised. Otherwise the generator is called without modifying the policy. """ # 'Resent-Date' is a mandatory field if the Message is resent (RFC 2822 # Section 3.6.6). In such a case, we use the 'Resent-*' fields. However, # if there is more than one 'Resent-' block there's no way to # unambiguously determine which one is the most recent in all cases, # so rather than guess we raise a ValueError in that case. # # TODO implement heuristics to guess the correct Resent-* block with an # option allowing the user to enable the heuristics. (It should be # possible to guess correctly almost all of the time.) self.ehlo_or_helo_if_needed() resent = msg.get_all('Resent-Date') if resent is None: header_prefix = '' elif len(resent) == 1: header_prefix = 'Resent-' else: raise ValueError("message has more than one 'Resent-' header block") if from_addr is None: # Prefer the sender field per RFC 2822:3.6.2. from_addr = (msg[header_prefix + 'Sender'] if (header_prefix + 'Sender') in msg else msg[header_prefix + 'From']) from_addr = email.utils.getaddresses([from_addr])[0][1] if to_addrs is None: addr_fields = [f for f in (msg[header_prefix + 'To'], msg[header_prefix + 'Bcc'], msg[header_prefix + 'Cc']) if f is not None] to_addrs = [a[1] for a in email.utils.getaddresses(addr_fields)] # Make a local copy so we can delete the bcc headers. msg_copy = copy.copy(msg) del msg_copy['Bcc'] del msg_copy['Resent-Bcc'] international = False try: ''.join([from_addr, *to_addrs]).encode('ascii') except UnicodeEncodeError: if not self.has_extn('smtputf8'): raise SMTPNotSupportedError( "One or more source or delivery addresses require" " internationalized email support, but the server" " does not advertise the required SMTPUTF8 capability") international = True with io.BytesIO() as bytesmsg: if international: g = email.generator.BytesGenerator( bytesmsg, policy=msg.policy.clone(utf8=True)) mail_options = (*mail_options, 'SMTPUTF8', 'BODY=8BITMIME') else: g = email.generator.BytesGenerator(bytesmsg) g.flatten(msg_copy, linesep='\r\n') flatmsg = bytesmsg.getvalue() return self.sendmail(from_addr, to_addrs, flatmsg, mail_options, rcpt_options) def close(self): """Close the connection to the SMTP server.""" try: file = self.file self.file = None if file: file.close() finally: sock = self.sock self.sock = None if sock: sock.close() def quit(self): """Terminate the SMTP session.""" res = self.docmd("quit") # A new EHLO is required after reconnecting with connect() self.ehlo_resp = self.helo_resp = None self.esmtp_features = {} self.does_esmtp = False self.close() return res if _have_ssl: class SMTP_SSL(SMTP): """ This is a subclass derived from SMTP that connects over an SSL encrypted socket (to use this class you need a socket module that was compiled with SSL support). If host is not specified, '' (the local host) is used. If port is omitted, the standard SMTP-over-SSL port (465) is used. local_hostname and source_address have the same meaning as they do in the SMTP class. context also optional, can contain a SSLContext. """ default_port = SMTP_SSL_PORT def __init__(self, host='', port=0, local_hostname=None, *, timeout=socket._GLOBAL_DEFAULT_TIMEOUT, source_address=None, context=None): if context is None: context = ssl._create_stdlib_context() self.context = context SMTP.__init__(self, host, port, local_hostname, timeout, source_address) def _get_socket(self, host, port, timeout): if self.debuglevel > 0: self._print_debug('connect:', (host, port)) new_socket = super()._get_socket(host, port, timeout) new_socket = self.context.wrap_socket(new_socket, server_hostname=self._host) return new_socket __all__.append("SMTP_SSL") # # LMTP extension # LMTP_PORT = 2003 class LMTP(SMTP): """LMTP - Local Mail Transfer Protocol The LMTP protocol, which is very similar to ESMTP, is heavily based on the standard SMTP client. It's common to use Unix sockets for LMTP, so our connect() method must support that as well as a regular host:port server. local_hostname and source_address have the same meaning as they do in the SMTP class. To specify a Unix socket, you must use an absolute path as the host, starting with a '/'. Authentication is supported, using the regular SMTP mechanism. When using a Unix socket, LMTP generally don't support or require any authentication, but your mileage might vary.""" ehlo_msg = "lhlo" def __init__(self, host='', port=LMTP_PORT, local_hostname=None, source_address=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT): """Initialize a new instance.""" super().__init__(host, port, local_hostname=local_hostname, source_address=source_address, timeout=timeout) def connect(self, host='localhost', port=0, source_address=None): """Connect to the LMTP daemon, on either a Unix or a TCP socket.""" if host[0] != '/': return super().connect(host, port, source_address=source_address) if self.timeout is not None and not self.timeout: raise ValueError('Non-blocking socket (timeout=0) is not supported') # Handle Unix-domain sockets. try: self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) if self.timeout is not socket._GLOBAL_DEFAULT_TIMEOUT: self.sock.settimeout(self.timeout) self.file = None self.sock.connect(host) except OSError: if self.debuglevel > 0: self._print_debug('connect fail:', host) if self.sock: self.sock.close() self.sock = None raise (code, msg) = self.getreply() if self.debuglevel > 0: self._print_debug('connect:', msg) return (code, msg) # Test the sendmail method, which tests most of the others. # Note: This always sends to localhost. if __name__ == '__main__': def prompt(prompt): sys.stdout.write(prompt + ": ") sys.stdout.flush() return sys.stdin.readline().strip() fromaddr = prompt("From") toaddrs = prompt("To").split(',') print("Enter message, end with ^D:") msg = '' while line := sys.stdin.readline(): msg = msg + line print("Message length is %d" % len(msg)) server = SMTP('localhost') server.set_debuglevel(1) server.sendmail(fromaddr, toaddrs, msg) server.quit()