RE: how to block SMTP Commands without ISA Ser

  • From: "John Tolmachoff \(Lists\)" <johnlist@xxxxxxxxxxxxxxxxxxx>
  • To: "'[ExchangeList]'" <exchangelist@xxxxxxxxxxxxx>
  • Date: Wed, 3 Dec 2003 13:00:49 -0800

> Look into a firewall solution.  Cisco pix uses a feature called fixup
> protocol.
> This prevents other protocols to have a session with your server using
> another protocol
> Such as telnet and at the same time only allows SMTP coming from the
> outside in.

Extremely bad advice. The Cisco SMTP fixup protocol breaks SMTP

John Tolmachoff
eServices For You

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