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How and why to disable certain ESMTP verbs

Serdar Yegulalp
11.19.2006
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Some firewalls and network devices filter out certain Extended Simple Mail Transfer Protocol (ESMTP) commands or "verbs." This can break communications between Exchange 2000, Exchange 2003, and other SMTP mail servers.

If you can't or don't want to modify how traffic is being filtered, you can still get around this problem by disabling the ESMTP verbs that are being blocked by your firewalls or network devices.

Below are the ESMTP verbs that can be disabled. Some of these may be rejected explicitly by a firewall or network device.

The best way to make changes to your ESMTP verb list is to use the ADSI Edit utility to modify the appropriate value in Active Directory, which will then replicate to the Metabase.

This process is described in slightly more detail in Microsoft Knowledge Base article 257569, "How to turn off ESMTP verbs in Exchange 2000 Server and in Exchange Server 2003."

One command often blocked by network boxes is actually not on this list -- BDAT. This ESMTP verb in turn attempts to invoke C

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HUNKING. In such a case, you probably will need to turn off CHUNKING until another workaround can be found.

A couple important side notes to keep in mind:

About the author: Serdar Yegulalp is editor of the Windows Power Users Newsletter.

Do you have comments on this tip? Let us know.

Related information from SearchExchange.com:

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