Event ID 7010 (MSExchangeTransport) on Exchange 2003

In my eventviewer I got a great amount of event ID errors 7010, MSEXchangeTransport. After reviewing the description I noticed all events came from the same IP-address. When looking up this IP, I found it to be a Unix/Linux host.

The full event ID is:

Event Type: Error
Event Source: MSExchangeTransport
Event Category: SMTP Protocol
Event ID: 7010
User:  N/A
This is an SMTP protocol log for virtual server ID 1, connection #1126. The client at “” sent a “mail” command, and the SMTP server responded with “501 5.5.4 Invalid Address  “. The full command sent was “mail FROM:  “.  This will probably cause the connection to fail.
For more information, click http://www.microsoft.com/contentredirect.asp.

What this Unix/Linux host does is sending the HELO command with the FQDN name of the mailserver. Except it also has a trailing dot (.). For example :

HELO domain.test.com.

When this is sent to an Exchange 2003 server it generates the following error:

501 5.5.4 Invalid Address


You are able to change Exchange and allow the trailing dot, but as this is not RFC compliant behaviour, I simply made sure the Unix/Linux host was configured to not send mail anymore.

If you want to change the behaviour of Exchange read the following knowledge base aricle : “501 5.5.4 Invalid Address” error message from a sending UNIX server

Hans Sleurink

Hans Sleurink works as a Senior Technical Consultant at VodafoneZiggo in the Netherlands where he designs and deploys Microsoft Unified Communications solutions . His main focus is on, but not limited to, Skype for Business / Lync including Enterprise Voice, Anywhere365, AudioCodes, KEMP, Exchange, Office 365, Active Directory and other UC related topics.

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