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SMTP 554: Body type not supported by remote host

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Contents

Occasionally, emails from our MailEnable email server were rejected with the message “SMTP 554: Body type not supported by Remote Host”. The cause was “8BitMIME advertising” by the SMTP service on Windows Server 2003.

Solution

Advertising can be disabled with the command below:

cscript c:\path\to\adsutil.vbs SET SmtpSvc/1/SmtpInboundCommandSupportOptions 3503297

Discussion

The detailed effects of the command are described in the following Microsoft KB article: How to turn off 8BITMIME in Windows 2000 and in Windows Server 2003 SMTP service.