Re: [Mailman-Users] Performance issues with 12K subscribers and 14K subscribers and personalized footers.

2013-10-01 Thread Mark Sapiro
On 10/01/2013 01:05 PM, Joseph Brennan wrote:
> 
> Worth noting, Mailman is a lot faster if you don't send to 1 at a time.


Often true, but the subject of this thread included "personalized
footers" which require sending separately to each recipient.

Also, what should be of concern is not only the time to deliver all the
messages from Mailman to the MTA, but also the total time from the start
of Mailman's delivery to the MTA until the MTA has finished delivering
to the recipient's MXs. I suspect this latter time is not so
dramatically impacted by Mailman's VERP or personalization.

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Re: [Mailman-Users] Performance issues with 12K subscribers and 14K subscribers and personalized footers.

2013-10-01 Thread Joseph Brennan


Worth noting, Mailman is a lot faster if you don't send to 1 at a time.

If they're all at the same domain, like our mass mail to staff and 
students, it is really fast:


 smtp to  for 25570 recips, completed in 39.777 seconds
 smtp to  for 41153 recips, completed in 84.754 seconds

Even if they are at many different domains it does well:

 smtp to  for 2016 recips, completed in 158.363 seconds
 smtp to  for 2199 recips, completed in 701.392 seconds


Joseph Brennan
Manager, Email and Systems Applications
Columbia University Information Technology



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Re: [Mailman-Users] Performance issues with 12K subscribers and 14K subscribers and personalized footers.

2013-10-01 Thread Ralf Hildebrandt
* Stephen J. Turnbull :
> Bryan Wright writes:
> 
>  > Now I just need to fine-tune sendmail so it speeds up as well, but
>  > that's a question for elsewhere.
> 
> Just a guess, but it may not be sendmail per se.  If there are issues
> with the DNS, that could result in multiple long delays, giving the
> half-hour time you're seeing for not all that many messages.  Of
> course sendmail may be throttled for some reason, or an upstream
> gateway is throttling your host, or something.

But all that should be clearly visible in the log
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