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I’ve been using the SMTPAUTHDirect.py handler to enable Mailman 2.1.x to use
SMTP-AUTH. It’s been working great, until I upgraded my server from Mavericks
(Mac OS X 10.9 + Server 3) to Yosemite (Mac OS X 10.10 + Server 4). For some
reason, Server 4 isn’t permitting “plain” authentication at all.
I have a list admin who is using a Google distribution list as the admin email
for a Mailman list. Whenever Mailman sends an administrative email, the Google
server responds thus:
>> Delivery to the following recipient failed permanently:
>>
>>
>>
>> Technical details of permanent failure:
>
