Some of our hosted Exchange customers are receiving HTML emails with blank bodies after migrating them from Exchange Server 2003 to Exchange server 2010. The affected users are running Outlook 2010 and have locally installed AntiVirus and AntiSpam Outlook Add-ins. We've found that disabling the AntiVirus and AntiSpam Add-ins resolves the issue. This isn't a long term solution for us as we can't dictate to our customers what local AntiVirus and AntiSpam software and components they can and can't use and trying to do so would be cumbersome and difficult. These users did not have this problem on Exchange Server 2003. We believe that the problem is that the SCL Header in the email is triggereing the AntiVirus and AntiSpam Add-ins to strip the content from these emails. The SCL header wasn't present in Exchange Server 2003, so this makes sense to us. What we'd like to do is to remove the SCL Header when the message is delivered to the mailbox. We do not want to remove or ignore the SCL Header when the emails enter or leave the Hub Transport server from or to the internet, we only want to remove the SCL Header when the email is delivered to the mailbox. We do not want to disable Content Filtering. Is there a way to achieve this by using the Header Firewall or by using a Transport Rule?
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