[Mailman-Users] Slow Performance on semi-large lists

D.J. Atkinson dj at pcisys.net
Thu Dec 14 18:58:46 CET 2000

Cool!  Thanks!  I'll discuss this with my other sysadmins and see if that
will cause any problems with anything they have going on.

On Thu, 14 Dec 2000, Chuq Von Rospach wrote:

>At 10:12 AM -0700 12/14/00, D.J. Atkinson wrote:
>>My probem is getting things from Mailman's qrunner into the sendmail queue
>>using the SMTPDirect module because sendmail takes up to 160 seconds per
>>name to reject names being fed to it from qrunner that it can't lookup.
>Try setting
>	O DeliveryMode=defer
>in your sendmail.cf. That causes sendmail to accept the mail without 
>making a DNS lookup on it first. Note that this also implies 
>DeliveryMode=queue, so stuff won't be delivered immediately. That 
>means (if you already aren't) that you need to do queue runs 
>aggressively using -q.
>On the other hand, I've found it's usually a good idea on a 
>mail-liser server box to user DeliveryMode=queue, a -q1m and use 
>MaxDaemonChildren to rate-limit sendmail. By tuning using the 
>multiple subdirectories sendmail 8.10 and later support, you can ramp 
>up delivery really quickly and not overload the system with burst 
>I'm just starting to experiment with defer (I've been meaning to for 
>a while, but things were going okay without it...), and so far, it 
>looks like a nice plus. It definitely speeds up MLM->MTA transfers.
>Chuq Von Rospach - Plaidworks Consulting (mailto:chuqui at plaidworks.com)
>Apple Mail List Gnome (mailto:chuq at apple.com)
>We're visiting the relatives. Cover us.
>Mailman-Users maillist  -  Mailman-Users at python.org

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