SMTP: Err Msg: Warning No Return Path (107087)


The information in this article 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

Modification Type:MajorLast Reviewed:10/2/2003
Keywords:KB107087
©2003 Microsoft Corporation. All rights reserved.