I am getting bombarded with between 3,000 - 7,000 (or possibly
more!) spam messages a day, along with the regular mail for 100+
users & wonder how taxing this is on my poor ol' dual 500 mail
server. Also, would it be possible, or advisable to just bounce it?
BOUNCE is what the sender sees when the destination REJECTS a msg.
As the destination MX, you are rejecting, not bouncing.
You can and should reject spam.
There are basically two points to reject:
1) before start of the DATA command, is the most efficient. This is
where "envelope rejectors" like IMGate do nearly all of their
rejecting, after the RCPT TO: command, before the DATA command is received.
2) after the DATA command but without 2xx accepting the msg
(content-scanners do it here since they have to scan the DATA content
before rejecting)
In no circumstances should the MX accept a msg into your system,
followed by some internal MTA deciding it can't be delivered. This
causes the previous hop (eg, your MX) to see a bounce and then, as
RFC specifies, to create a non-delivery alert msg back to the
return-path (envelope sender or Reply-to header). This is never
acceptable, in today's Internet, because the return path is most often forged.
Len
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