Microsoft KB Archive/107087

= SMTP: Err Msg: Warning No Return Path =

Article ID: 107087

Article Last Modified on 10/30/2006

-

APPLIES TO


 * Microsoft Mail Gateway to SMTP 2.1
 * Microsoft Mail Gateway to SMTP 3.0

-



This article was previously published under Q107087



SYMPTOMS
The Microsoft Mail Gateway to SMTP displays this warning:

WARNING No return path

[tx] 250 Sender OK



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

[rx] mail from:<>



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



MORE INFORMATION
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 [192.245.59.139]

[tx] 220 All set, fire away

[rx] hello fake.host.com

[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

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.