Body type not supported by Remote Host

Having some trouble with a IIS SMTP on Windows 2003 Server, delivering mail to a mail server on OS X Server after incoming messages have been scanned by GFi MailSecurity; it seems to be caused by it not accepting 8-bit MIME, which IIS SMTP seems to send by default. Solution seems to force the SMTP server on the Windows 2003 box to send in 7-bit by default, but I can't find the appropriate trick for Windows 2003 Server, just for Windows 2000 Server and its IIS version.

That trick requires a program called mda... something or other, can't find my notes :(  But anyway, it wasn't present on the Windows 2003 Server CD, anyone know how to solve this? Most mail is getting thru, but some of it is bounced to the postmaster:

Diagnostic-Code: smtp;554 5.6.1 Body type not supported by Remote Host

Any takers?
jfeeAsked:
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cldr2001Commented:
It is mdutil.exe.

See http://support.microsoft.com/default.aspx?scid=http://support.microsoft.com:80/support/kb/articles/Q262/1/68.asp&NoWebContent=1

I didn't find the utility on windows 2003 disk, but I used the one from windows 2000 and it seemed to work.

Try

telnet <host> 25
ehlo <yourdomain>

to check, before and after
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