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Microsoft KB Archive/107087

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Knowledge Base

Article ID: 107087

Article Last Modified on 10/30/2006


  • Microsoft Mail Gateway to SMTP 2.1
  • Microsoft Mail Gateway to SMTP 3.0

This article was previously published under Q107087


The Microsoft Mail Gateway to SMTP displays this warning:

WARNING No return path
[tx] 250 Sender OK


The name provided in the "mail from" received by the sending host is incomplete or contains a null value:

[rx] mail from:<>


None necessary: this message is informational only and requires no action by the Mail Administrator. The Gateway continues to process mail.


The example below shows an address without a beginning "<" and an ending ">". This log file was created using the undocumented -CD option which tells the Gateway to display debug information.

>Incoming SMTP connection from []
[tx] 220 All set, fire away
[rx] hello
[tx] 250 Hi there, pleased to meet you
[rx] mail from:jdoe
>WARNING No return path
[tx] 250 Sender OK

Additional query words: 2.10 3.00 2.1 3.0 warning

Keywords: KB107087