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Exchange Server5.5 error 503

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by jxliu99

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Server: Microsoft Exchange 5.5
Client: Windows98
Problem: Sent email to external account, got an undeliverable message, 503 Please introduce yourself, first.

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by john.cahill

jxliu99,

My name is John, I am network support professional for Bank of America. My suggestion is for you to review the following M$ Technet article:

PSS ID Number: Q202765
Article last modified on 06-04-1999

winnt:4.0,5.0,5.5

winnt

======================================================================
-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Exchange Server, versions 4.0, 5.0, 5.5
-------------------------------------------------------------------------------

SYMPTOMS
========

Occasionally, messages from Exchange Server through the Internet Mail Service
(Internet Mail Connector in version 4.0) to a remote SMTP e-mail domain are
rejected. A non-delivery report (NDR) is returned to the sender with the
following error message:

503 Sender already specified.

CAUSE
=====

Exchange Server makes connections to remote SMTP mailers or relay hosts to
deliver SMTP m

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