Re: [AMaViS-user] To Warn Or not To Warn?

At 08:02 AM 11/15/2006, Andres wrote:
>Off Site?
>:)
>
>Well, I have this on my 50-user file config
>
>$warn_offsite = 1;
>
>Is this a good practice ? Or should I shut this down to
>lower the load
>on the MTA? (the load of sending warn emails to outside)

My opinion is no, don't do this. Spam and viruses commonly
have forged sender addresses, so your offsite warning will
often just annoy some innocent third party, or will be
undeliverable and clog your queue while waiting to
expire. The innocent third party may eventually get tired
of your backscatter and block your server.
I also don't like warning local recipients about blocked
spam and viruses. Getting 100 "hey, we blocked some spam
addressed to you" messages is nearly as annoying as getting
100 spam messages. If local policy requires the user to
know about blocked mail, just defang the mail and pass it
on rather than sending warnings.

It may be useful to warn both local and offsite about
banned files. Hopefully this will just be a small fraction
of detections, and has a decent chance of going to the real
sender & recipient.


--
Noel Jones


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