Error Message: Event ID 1722: An Unknown SMTP Command Occurred (312357)


The information in this article applies to:

  • Microsoft Windows 2000 Server
  • Microsoft Exchange Server 5.0
  • Microsoft Internet Security and Acceleration Server 2000
This article was previously published under Q312357

SYMPTOMS

If you have Internet Security and Acceleration (ISA) Server installed with Simple Mail Transport Protocol (SMTP) content filtering enabled, the following event may occur:
Event ID 1722: An unknown SMTP command occurred

CAUSE

If the SMTP content application filter is installed, you must explicitly state which SMTP commands are permitted. Event 1722 occurs if you do not explicitly state the SMTP commands that are in use.

RESOLUTION

To resolve this issue, add the appropriate SMTP command in the application filter. Or, you can disable SMTP content filtering if it is not necessary.
Modification Type:MajorLast Reviewed:6/3/2003
Keywords:kbenv kberrmsg kbprb KB312357
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