[courier-users] limit number of imap-logins per user

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Hi.

I have courier-mta running with IMAP access.

The IMAP access comes from two sources, some regular clients and a webmail=
=20
server (Squirrelmail).

Recently, I had the problem that the webmail service was broken du=20
to "MAXPERIP" setting in imapd config file. It's clear, the access comes fr=
om=20
the same host for all users.

After increasing this value, I ran into another problem: Thunderbird (maybe=
=20
other clients too) always tries to DoS an IMAP server. When 10 connections=
=20
are allowed, thunderbird will use them all.
So when a user did some ugly operation (don't know what he did) on his tras=
h=20
mailbox, there were 10 imap processes each consuming 10% of the CPU. This=20
forces the system scheduler to serve this user's stuff all the time.


So I have to decrease the limit per IP to stop this behaviour. That will br=
eak=20
Webmail access.

So there are two questions:
* Is there any chance to limit the parallel connections per user account=20
(system-user or imap-user)? system-wide or individually...
* Is there any way to set exceptions for the MAXPERIP limit. So hat I can s=
et
something different for the webmail server.


If none of these is true: Would that be hard to implement?

cu, Bernd

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