Is there a kind of rate limit for same senders from different MX (Spam) ?

10 msg	Placement of reject_unverified_recipient in mai...
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Is there a kind of rate limit for same senders ...
\ Alexander Grüner (26 Apr 2007)
. \ Robert Felber (26 Apr 2007)
. \ Robert Felber (26 Apr 2007)
. . \ mouss (26 Apr 2007)

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Subject:	Is there a kind of rate limit for same senders from different MX (Spam) ?
Group:	Postfix-users
From:	Alexander Grüner
Date:	26 Apr 2007

Hi,

there is almost daily the situation that a new worm, spam etc. is going
around.

There is always the same pattern. The mail is coming e.g. from
info. The recipient is always different, but mostly valid (I
have about 4000 Users), but the sending MX is of course mostly different.

Normally if I see somthing like this, I am going to manually block this
sender (e.g. info) for 2 days.

Can you somehow limit this automatically similar to something like a
rate limit ?

If the same sender is coming from n different domains, then block it for
time interval x ? Any ideas ?

My postfix antispam solution is already blocking 99,8 % of spam, but in
case of info we received about 14000 delivery attempts. So more
than 20 are still delivered, with 20 possible people clicking on
whatever...(yes, they know not to click and have a antivirus)....

Regards,
Alexander