[Exim] Conditional callout

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Συντάκτης: Russell Wilton
Ημερομηνία:  
Προς: exim-users
Αντικείμενο: [Exim] Conditional callout
Environment: Exim Ver 4.05 on RedHat linux Ver 7.2

This may be obvious, but it is possible to do a "verify sender/callout"
for specific domains only. We found that spammers forging return
addresses almost always use one of the big domains like hotmail, aol,
excite, etc., which respond properly to a callout. So I added a deny
command to my RCPT ACL to just do callouts for them and let everything
else pass:

 deny    sender_domains = +callout_domains
         message = We block non-existent senders.
         !verify = sender/callout


The callout_domains list is the list of big domains that I want to do
callouts for. This is blocking about 1000 spam messages a day for us,
out of our normal input of about 25,000, so it seems to be pretty effective.

--
Russell D. Wilton                     E Mail: WILTON@???
Network Services Manager              Voice:   (403) 329-2525
University of Lethbridge              FAX:     (403) 382-7108
4401 University Drive   Lethbridge, Alberta, CANADA   T1K 3M4