When emails are relayed from the IIS SMTP server to the Microsoft Exchange server, the following error occurs:Body type not supported by Remote Host
Microsoft Windows Server 2000
Microsoft Windows Server 2003
Microsoft IIS SMTP
To stop the Microsoft Windows 2000 and Microsoft Windows Server 2003 IIS SMTP Service from advertising 8BITMIME, please refer to the following Microsoft Knowledge base article: http://support.microsoft.com/default.aspx?scid=kb;en-us;Q262168
By default, the IIS SMTP service advertises 8BITMIME and allows MIME messages to be relayed. However, Microsoft Exchange Server versions 4.0, 5.0, and 5.5 are not able to handle 8-bit MIME messages.