Python smtplib proxy support

Question

I would like to send email through a proxy.

My current implementation is as follows:

I connect to the smtp server with authentication. After I've successfully logged in, I send an email. It works fine but when I look at the email header I can see my host name. I would like to tunnel it through a proxy instead.

Any help will be highly appreciated.

Answer 1

Use SocksiPy:

import smtplib
import socks

#'proxy_port' should be an integer
#'PROXY_TYPE_SOCKS4' can be replaced to HTTP or PROXY_TYPE_SOCKS5
socks.setdefaultproxy(socks.PROXY_TYPE_SOCKS4, proxy_host, proxy_port)
socks.wrapmodule(smtplib)

smtp = smtplib.SMTP()
...

Answer 2

I had a similar problem yesterday, this is the code I wrote to solve the problem. It invisibly allows you to use all of the smtp methods via proxy.

#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
#       smtprox.py
#       Shouts to suidrewt
#
# ############################################# #
# This module allows Proxy support in MailFux.  #
# Shouts to Betrayed for telling me about       #
# http CONNECT                                  #
# ############################################# #

import smtplib
import socket

def recvline(sock):
    stop = 0
    line = ''
    while True:
        i = sock.recv(1)
        if i == '\n': stop = 1
        line += i
        if stop == 1:
            break
    return line

class ProxSMTP( smtplib.SMTP ):

    def __init__(self, host='', port=0, p_address='',p_port=0, local_hostname=None,
             timeout=socket._GLOBAL_DEFAULT_TIMEOUT):
        """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.  An SMTPConnectError is raised
        if the specified `host' doesn't respond correctly.  If specified,
        `local_hostname` is used as the FQDN of the local host.  By default,
        the local hostname is found using socket.getfqdn().

        """
        self.p_address = p_address
        self.p_port = p_port

        self.timeout = timeout
        self.esmtp_features = {}
        self.default_port = smtplib.SMTP_PORT
        if host:
            (code, msg) = self.connect(host, port)
            if code != 220:
                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
        smtplib.SMTP.__init__(self)

    def _get_socket(self, port, host, timeout):
        # This makes it simpler for SMTP_SSL to use the SMTP connect code
        # and just alter the socket connection bit.
        if self.debuglevel > 0: print>>stderr, 'connect:', (host, port)
        new_socket = socket.create_connection((self.p_address,self.p_port), timeout)
        new_socket.sendall("CONNECT {0}:{1} HTTP/1.1\r\n\r\n".format(port,host))
        for x in xrange(2): recvline(new_socket)
        return new_socket