Re: i5 spam reduction

[David Gibbs <david@xxxxxxxxxxxx>]

Jeff Crosby wrote:
> I get roughly 200-300 spam emails a day.  2 days ago Supportline pointed out
> to me that I can add RBLs (Realtime Black Lists) to i5 SMTP.  I added 3 RBLs
> and immediately cut my spam by 90%.  I now get about 20/day.

RBL's need to be used with care.  Some of them are far more aggressive 
than others.

I'm currently using: relays.ordb.org, bl.spamcop.net, dnsbl.njabl.org, 
list.dsbl.org, cbl.abuseat.org, and opm.blitzed.org.

Make sure you put some reference in the rejection message that indicates 
WHY the message is being rejected.  Such as: "Rejected due to open 
relay, see http://<url to rbl lookup>?ip=<client ip>".  I've had people 
tell me that they didn't realize they had an open relay, and a message 
to midrange.com informed them of it.

FWIW: There is *NEVER* a situation where an open relay is a reasonable 
solution.  Any mail server that does not support authenticated or 
restricted relay should be abandoned with all haste.

david

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David Gibbs
david@xxxxxxxxxxxx

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