如何使用Python使用SMTP over SSL连接到邮件服务器?

时间:2010-05-27 17:58:10

标签: python email ssl smtp

所以我一直很难从学校的电子邮件地址发送电子邮件。这是SSL,我只能在Matt Butcher的网上找到这个代码,它可以使用SSL:

import smtplib, socket

__version__ = "1.00"

__all__ = ['SMTPSSLException', 'SMTP_SSL']

SSMTP_PORT = 465

class SMTPSSLException(smtplib.SMTPException):
    """Base class for exceptions resulting from SSL negotiation."""

class SMTP_SSL (smtplib.SMTP):
    """This class provides SSL access to an SMTP server.
    SMTP over SSL typical listens on port 465. Unlike StartTLS, SMTP over SSL
    makes an SSL connection before doing a helo/ehlo. All transactions, then,
    are done over an encrypted channel.

    This class is a simple subclass of the smtplib.SMTP class that comes with
    Python. It overrides the connect() method to use an SSL socket, and it
    overrides the starttles() function to throw an error (you can't do 
    starttls within an SSL session).
    """
    certfile = None
    keyfile = None

    def __init__(self, host='', port=0, local_hostname=None, keyfile=None, certfile=None):
        """Initialize a new SSL SMTP object.

        If specified, `host' is the name of the remote host to which this object
        will connect. If specified, `port' specifies the port (on `host') to
        which this object will connect. `local_hostname' is the name of the
        localhost. By default, the value of socket.getfqdn() is used.

        An SMTPConnectError is raised if the SMTP host does not respond 
        correctly.

        An SMTPSSLError is raised if SSL negotiation fails.

        Warning: This object uses socket.ssl(), which does not do client-side
        verification of the server's cert.
        """
        self.certfile = certfile
        self.keyfile = keyfile
        smtplib.SMTP.__init__(self, host, port, local_hostname)

    def connect(self, host='localhost', port=0):
        """Connect to an SMTP server using SSL.

        `host' is localhost by default. Port will be set to 465 (the default
        SSL SMTP port) if no port is specified.

        If the host name ends with a colon (`:') followed by a number, 
        that suffix will be stripped off and the
        number interpreted as the port number to use. This will override the 
        `port' parameter.

        Note: This method is automatically invoked by __init__, if a host is
        specified during instantiation.
        """
        # MB: Most of this (Except for the socket connection code) is from 
        # the SMTP.connect() method. I changed only the bare minimum for the 
        # sake of compatibility.
        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 socket.error, "nonnumeric port"
        if not port: port = SSMTP_PORT
        if self.debuglevel > 0: print>>stderr, 'connect:', (host, port)
        msg = "getaddrinfo returns an empty list"
        self.sock = None
        for res in socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM):
            af, socktype, proto, canonname, sa = res
            try:
                self.sock = socket.socket(af, socktype, proto)
                if self.debuglevel > 0: print>>stderr, 'connect:', (host, port)
                self.sock.connect(sa)
                # MB: Make the SSL connection.
                sslobj = socket.ssl(self.sock, self.keyfile, self.certfile)
            except socket.error, msg:
                if self.debuglevel > 0: 
                    print>>stderr, 'connect fail:', (host, port)
                if self.sock:
                    self.sock.close()
                self.sock = None
                continue
            break
        if not self.sock:
            raise socket.error, msg

        # MB: Now set up fake socket and fake file classes.
        # Thanks to the design of smtplib, this is all we need to do
        # to get SSL working with all other methods.
        self.sock = smtplib.SSLFakeSocket(self.sock, sslobj)
        self.file = smtplib.SSLFakeFile(sslobj);

        (code, msg) = self.getreply()
        if self.debuglevel > 0: print>>stderr, "connect:", msg
        return (code, msg)

    def setkeyfile(self, keyfile):
        """Set the absolute path to a file containing a private key.

        This method will only be effective if it is called before connect().

        This key will be used to make the SSL connection."""
        self.keyfile = keyfile

    def setcertfile(self, certfile):
        """Set the absolute path to a file containing a x.509 certificate.

        This method will only be effective if it is called before connect().

        This certificate will be used to make the SSL connection."""
        self.certfile = certfile

    def starttls():
        """Raises an exception. 
        You cannot do StartTLS inside of an ssl session. Calling starttls() will
        return an SMTPSSLException"""
        raise SMTPSSLException, "Cannot perform StartTLS within SSL session."

然后是我的代码:

import ssmtplib
conn = ssmtplib.SMTP_SSL('HOST')
conn.login('USERNAME','PW')
conn.ehlo()
conn.sendmail('FROM_EMAIL', 'TO_EMAIL', "MESSAGE")
conn.close()

得到了这个错误:


/Users/Jake/Desktop/Beth's Program/ssmtplib.py:116: DeprecationWarning: socket.ssl() is deprecated.  Use ssl.wrap_socket() instead.
  sslobj = socket.ssl(self.sock, self.keyfile, self.certfile)
Traceback (most recent call last):
  File "emailer.py", line 5, in 
    conn = ssmtplib.SMTP_SSL('HOST')
  File "/Users/Jake/Desktop/Beth's Program/ssmtplib.py", line 79, in init
    smtplib.SMTP.init(self, host, port, local_hostname)
  File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/smtplib.py", line 239, in init
    (code, msg) = self.connect(host, port)
  File "/Users/Jake/Desktop/Beth's Program/ssmtplib.py", line 131, in connect
    self.sock = smtplib.SSLFakeSocket(self.sock, sslobj)
AttributeError: 'module' object has no attribute 'SSLFakeSocket'

谢谢!

1 个答案:

答案 0 :(得分:1)

考虑到弃用警告,您发现的代码似乎是旧版本。也许你可以使用stdlib:从Python 2.6开始有一个SMTP_SSL类,至少2.4,在明文SMTP类中有一个starttls方法。