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Postfix Documentation
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Postfix XFORWARD Howto

Purpose of the XFORWARD extension to SMTP

The XFORWARD command targets the following problem:

  • Logging after SMTP-based content filter. With the deployment of Internet->MTA1->filter->MTA2 style content filter applications, the logging of client and message identifying information changes when MTA1 gives the mail to the content filter. To simplify the interpretation of MTA2 logging, it would help if MTA1 could forward remote client and/or message identifying information through the content filter to MTA2, so that the information could be logged as part of mail handling transactions.

This extension is implemented as a separate EMSTP command, and can be used to transmit client or message attributes incrementally. It is not implemented by passing additional parameters via the MAIL FROM command, because doing so would require extending the MAIL FROM command length limit by another 600 or more characters beyond the space that is already needed to support other extensions such as AUTH.

Postfix Documentation
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