Article ID: 958856 - View products that this article applies to.
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When you search the message tracking logs on a Microsoft Exchange Server 2007-based server, the following message may be logged in the Application log:
Event Type: Warning
This issue occurs because the response from the remote SMTP server may include bare “CR” or bare “LF” characters. Exchange Server 2007 cannot appropriately handle these characters.
To resolve this problem, install Update Rollup 5 for Exchange Server 2007 Service Pack 1.
For more information about Update Rollup 5 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic:
Description of Update Rollup 5 for Exchange Server 2007 Service Pack 1For more information about how to obtain the latest Exchange service pack or update rollup, see the following Exchange Help topic:
How to Obtain the Latest Service Pack or Update Rollup for Exchange 2007
Request for Comments (RFC) 2821 indicates that bare CR and bare LF characters cannot be used in SMTP transmissions. For more information about RFC 2821, visit the following RFC Web site:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 958856 - Last Review: January 15, 2015 - Revision: 1.1