[Mailman-Users] Mailman Stalls for Outgoing Emalis

Kevin A. McGrail kevin.mcgrail at thoughtworthy.com
Wed Aug 9 06:39:15 CEST 2006

> Have you looked at the section of the FAQ discussing performance tuning of 
> your system?  See FAQs 6.3, 6.6, and 6.8.

Thanks.  I've made some tweaks in line with these FAQs and have some 

FAQ 6.6 mentions SMTP_MAX_RCPTS = 10 but 6.3 mentions 2-5.  I'm using VERP 
so I believe this is irrelevant to my installation but it might be good to 
clarify for consistency.

Also FAQ 6.6 mentions changes because mailman didn't used to use a FIFO 
queue.  The FAQ specifies this was a target for 2.1.X mailman and to my 

>>  I believe the box is hitting it's limit of sendmail services and 
>> refusing
>>  service and that the mailman service is not gracefully retrying later,
>>  either by design or a bug.  Is this expected behavior or is there a 
>> setting
>>  I have missed?
> That's a reasonable conclusion, but with proper tuning of the MTA and 
> configuration of Mailman, you shouldn't reach that point.  Start with the 
> FAQ entries mentioned above.

The box is an incoming mail server as well so while we can tweak things to 
make running out of child daemons minimal, with the dictionary 
attacks+spammers+normal mail traffic, I see no way that I can guarantee that 
the box will not run out of connections available.  Am I correct that if 
this occurs, the qfile/out runner will stall?

Thanks again,

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