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Re: [FW-1] SMTP Security Server has the potential of being an openrelay.


  • To: [email protected]
  • Subject: Re: [FW-1] SMTP Security Server has the potential of being an openrelay.
  • From: Crist Clark <[email protected]>
  • Date: Fri, 1 Nov 2002 09:31:00 -0800
  • Organization: Globalstar Communications
  • References: <OF23BCA0C4.35B52D92-ON0A256C64.000DAA48-0A256C64.00128A4A@consulting.fujitsu.com>
  • Reply-to: Mailing list for discussion of Firewall-1 <[email protected]>
  • Sender: Mailing list for discussion of Firewall-1 <[email protected]>

This is a generic issue whenever you chain SMTP relays. You cannot enforce
relay restrictions only at the final MTA. As you pointed out, intermediate
MTAs will lose the information about the last external MTA. You must enforce
relay restrictions at all border MTAs or restrict relaying to only specific
recipients (which is easier said than done).
--
Crist J. Clark                               [email protected]
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