Hi, We have an SMTP connector (using a Smarthost, not DNS) in our Exchange 2003 org that will route out mail that it does not find a recipient for for a certain domain in Recipient Policy. Let's call it: domain.com So if no one in our Active Directory has the email address someone@domain.com it will route that mail out via this connector directly to an Exim mail server that currently hosts the rest of the mailboxes (We are in a migration stage, getting the Exim users over to Exchange 2003). It is running Exim 4.43 (that's what it says when I telnet to it). Not all mail is getting to it, that is the problem. Some mails are returned stating: Action: failed Status: 5.6.1 Diagnostic-Code: smtp;554 5.6.1 Body type not supported by Remote Host This only tends to happen when a mail is forwarded through the connector when recieved by Exchange from certain web mail clients or programs. For instance if we send an email from another Exchange Org using Outlook then it is recieved and then sent along the SMTP connector to the Exim mail server fine and the mail is recieved. However some people using webmail clients from other ISPS are getting the above error. I've got a feeling this is a 7BIT/8BIT MIME problem so what I did on the SMTP connector was disable ESMTP (effectively saying HELO instead of EHLO) in the hope it would fix it and convert the mail correctly so that the Exim 4.43 mail server could recieve the mail. However it still isn't.. Again this is only happening with certain mails. It all depends what format the message is recieved by Exchange it appears. Anyone ever had this before? Is this a shortfall with Exchange or Exim 4.43? Can it be fixed? Cheers oll
