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===================
SMTP authentication
===================
The SMTP server may require authentication. Mailman supports setting the SMTP
user name and password. The actual authentication mechanism used is
determined by Python's `smtplib module`_, which tries the more secure
`CRAM-MD5` method first, followed by the less secure mechanisms `PLAIN` and
`LOGIN`.
When sending authentication data between Mailman and the MTA over an unsecured
network, the submission (mail) server should offer `CRAM-MD5` as mechanism to
have Python's `smtplib module` automatically choose the more secure mechanism.
When the user name and password match what's expected by the server,
everything is a-okay.
>>> mlist = create_list('test@example.com')
By default there is no user name and password, but this matches what's
expected by the test server.
>>> config.push('auth', """
... [mta]
... smtp_user: testuser
... smtp_pass: testpass
... """)
Attempting delivery first must authorize with the mail server.
::
>>> from mailman.mta.bulk import BulkDelivery
>>> bulk = BulkDelivery()
>>> msg = message_from_string("""\
... From: aperson@example.com
... To: test@example.com
... Subject: My first post
... Message-ID: <first>
...
... First post!
... """)
>>> bulk.deliver(mlist, msg, dict(recipients=['bperson@example.com']))
{}
>>> print(smtpd.get_authentication_credentials())
AHRlc3R1c2VyAHRlc3RwYXNz
>>> config.pop('auth')
But if the user name and password does not match, the connection will fail.
>>> config.push('auth', """
... [mta]
... smtp_user: baduser
... smtp_pass: badpass
... """)
>>> bulk = BulkDelivery()
>>> response = bulk.deliver(
... mlist, msg, dict(recipients=['bperson@example.com']))
>>> dump_msgdata(response)
bperson@example.com: (571, b'Bad authentication')
>>> config.pop('auth')
.. _`smtplib module`: http://docs.python.org/library/smtplib.html
|
