> Is there a possibility to limit maximum recipients? One of our
> customers asked, whether SM dos avoid Mass-Mailing. If there is the
> possibility to limit recipients, this would fulfill my/our needs.

http://squirrelmail.org/plugin_view.php?id=213

However, this type of restriction is always best done in the SMTP server
instead of using a SM plugin.

> Next question is the hardware needed. We are planning to run SM for
> 10.000 up to 100.000 Users.
>
> Systems are LAMP.
>
> What other requirements does the hosting system need, to enable a
> performant behaviour?

SM needs very little in terms of system resources.  However, your biggest
hit will probably be on the IMAP server.  If you have closer to 10,000
users, depending on how busy they are, you can keep them all on one
decently fast machine, but much over that and you want to start planning a
better architecture.  If you run something like SpamAssassin, also be
aware that it is an even bigger hog than IMAP of both memory and CPU. 
There have been a few threads on the mailing lists in the past (one only
about a month ago) where people gave recommendations for large systems. 
Also, read:

http://www.squirrelmail.org/wiki/en_US/SquirrelMailPerformance

> Regarding the amount of attendance, we are asking ourselves, how much
> security-updates have been released during the last year. Is there any
> list, where one could find out?

Not really.  We are talking about being more intentional about that, but
if you want to be the safest, use a snapshot of the CVS code from the
STABLE branch (currently 1.4.4) and you'll be up to date.

-paul


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