SMTP Fixup Issue

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Revision as of 12:36, 15 March 2016 by MCoyne (talk | contribs)

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This is also referred to as SMTP Inspection and is a feature on Cisco firewalls. Unfortunately it cause often hard to diagnose blocking of email passing through the firewall and is considered a useless anti-spam feature by most.

  root@colo4(~)# telnet server.at.some.domain 25
  Trying 1.2.3.4...
  Connected to server.at.some.domain.
  Escape character is '^]'.
  220 *************************************************************************************************