Blocking spam based on from address
MailScanner at ecs.soton.ac.uk
Sat Feb 4 11:11:55 GMT 2006
Michael Masse wrote:
> Since we are using MS as a relay there is never a case where mail
> destined to a user within our domain will ever be from another user
> within our domain because that all happens internally within Groupwise.
> The only email that goes through MS that truthfully has a from address
> of our domain is outgoing email. Since MS calls sendmail, can MS tell
> sendmail to drop all email claiming to come from our domain unless it
> actually is, or is this something that I have to do at the MTA level?
You could use a ruleset for "Reject Message" saying something like
From: yourdomain.com and 152.67. no
FromOrTo: default yes
That way only mail whose sender is user at yourdomain.com and comes from
the 152.67. network is allowed through.
All other mail is rejected with a nice polite message.
You could better apply this ruleset is "Is High Scoring Spam" instead so
that you can just drop it with a "delete" action rather than send a
bounce message, which is very bad practice.
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