[Mailman-Users] SMTP_MAX_RCPTS setting for gmail and others

Mark Sapiro msapiro at value.net
Mon Mar 21 01:08:50 CET 2005

Paul H Byerly wrote:

>         I've recently turned off personalisation on a couple of large 
>lists because it was running server load up too much when I sent thousands 
>of individual, html e-mails.  Now I am getting "failed with code 452: 4.5.3 
>Too many recipients" from gmail, hotmail, aol, yahoo and others.
>         I realise the solution is to drop the value of 
>SMTP_MAX_RCPTS.  I'm playing with various settings, but I wonder if anyone 
>knows a value that seems to get past all the big systems?

There are discussions of this in the list archives. An old post at
says the magic number for AOL at that time appeared to be about 17.

However, see articles 4.11 and 4.12 in the FAQ
(http://www.python.org/cgi-bin/faqw-mm.py) which say the optimal value
for SMTP_MAX_RCPTS is in the range 2 - 5 from a performance standpoint.

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

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