I would block all tcp/25 and tell the users to use "my" own smtp-server and
restrict the sender etc from there and perhaps use some of the following
features -->

From postfix manualpage :

smtpd_client_connection_count_limit (50)
How many simultaneous connections any SMTP client is allowed to make to the
SMTP service.

smtpd_client_connection_rate_limit (0)
The  maximal  number of connection attempts any client is allowed to make to
this service per time unit.

smtpd_client_connection_limit_exceptions ($mynetworks)
Clients that are excluded from connection count or connection rate
restrictions.

Good luck!

Kind Regards

/ Fredrik

-----Original Message-----
From: Drew Lehman - DigitaTech [mailto:dlehman at digitatech dot com] 
Sent: den 5 april 2007 17:15
To: m0n0wall at lists dot m0n0 dot ch
Subject: [m0n0wall] Limit SMTP?

Does anyone know of a way to limit the number of smtp connections per 
minute?  I don't want to disable them, but I do want to discourage 
access points from being spammer friendly.




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