Microsoft KB Archive/208920

= OLEXP: Err Msg: Mail Cannot Be Sent at This Time. The Server Returned the Message "Invalid RFC Syntax for ." =

Article ID: 208920

Article Last Modified on 12/5/2003

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APPLIES TO


 * Microsoft Outlook Express 4.0c for Macintosh
 * Microsoft Outlook Express 4.02
 * Microsoft Outlook Express 4.0 for Macintosh
 * Microsoft Outlook Express 4.0 for Macintosh

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This article was previously published under Q208920



For information about the differences between Microsoft Outlook Express and Microsoft Outlook e-mail clients, click the following article number to view the article in the Microsoft Knowledge Base:

257824 OL2000: Differences Between Outlook and Outlook Express



SYMPTOMS
When you attempt to send an e-mail message using Outlook Express, you may receive the following error message:

Mail cannot be sent at this time. The server returned the message "Invalid RFC syntax for ."



CAUSE
This behavior can occur if your Internet service provider (ISP) is using Ipswitch IMail version 4.03.



RESOLUTION
To resolve this behavior, contact your ISP and request that they upgrade their IMail server to version 4.04 or later.



MORE INFORMATION
Keywords: kberrmsg kbprb KB208920

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