Knowledge Base

SMTP: Err Msg: Warning No Return Path

Article ID: 107087

Article Last Modified on 10/30/2006


APPLIES TO


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