Karsten Becker wrote:
>
>I'm running an Ubuntu Server 10.04 LTS (Lucid Lynx) with the repository
>mailman in version
>> ii  mailman                         1:2.1.13-1ubuntu0.2
>Powerful, web-based mailing list manager


Please see the FAQ at <http://wiki.list.org/x/OIDD>.


[...]
>/var/log/mailman/smtp
>
>> Nov 27 08:00:22 2012 (10393) 
>> <mailman.0.1353999601.22399.carbonmark...@lists.mycompany.eu> smtp to 
>> carbonmarkets for 1 recips, completed in 21.021 seconds
>> Nov 27 08:00:43 2012 (10393) 
>> <mailman.1.1353999601.22399.agricult...@lists.mycompany.eu> smtp to 
>> agriculture for 1 recips, completed in 21.013 seconds
[...]


It is extreme and highly unusual for a single Mailman-Postfix SMTP
transaction to take 20 seconds, but it is almost certainly due to
something in your Postfix configuration.

See the FAQs at <http://wiki.list.org/x/roA9> and
<http://wiki.list.org/x/rIA9> for some hints that may help.

Also see the FAQ at <http://wiki.list.org/x/-IA9> for a way to enable
logging from Python's smtplib which may help you determine in exactly
what part of the SMTP transaction the delay occurs in the response
from Postfix.

-- 
Mark Sapiro <m...@msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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