Re: [Asrg] MXs Used As Authentication - Why RMX?

["Alan DeKok" <[e-mail]>]

Bill Cole <[e-mail]> wrote:
> It is not what happens in the real world. For sites handling 
> significant mail volume, outbound mail and inbound mail are large 
> enough and different enough in their ideal system design that it 
> makes sense to have them handled by different systems.

  Further, anecdotal evidence suggests that the simple existence of
outgoing SMTP servers means that they will be targeted by spammers.

  That is, mailing list archives contain IP's of outgoing SMTP
servers, and spammers troll the net looking for such IP's.  When
found, those IP's are hit with delivery attempts for that domain,
relay attempts, and other nonsense.

  It's been suggested that outgoing SMTP servers should be in an
entirely different address range than incoming servers, and that those
outgoing servers shouldn't accept ANY traffic other than what they
originate.  No SMTP, no ICMP, nothing at all.

  Similarly, I'm seeing 1000's of delivery attempts a day for a
domain, to an IP which hasn't been the MX for that domain for years.
Spammers really are that desperate.

  Alan DeKok.

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