Email sent by internal users is affected by content filtering policies configured for Inbound messages.
NOTE: This article does not apply to issues with SPAM filtering.
Exchange 2007 uses role based mail routing. Email sent to an Exchange HUB server are considered "inbound" causing the inbound rule to apply.
Upgrade to SMSMSE 6.5.1 or higher. To download the latest release, read Obtaining an update or an upgrade for a Symantec Corporate product.
Define the set of internal domains. SMSMSE uses this list to exempt emails with these senders from being considered as inbound.
If you continue to see internal emails treated as inbound after setting up the list of internal domains, complete the follow steps to exempt internal email addresses from the rule:
After implementing the changes for each of your enabled content rules, click Deploy Changes
Headers from a 2007 internal message will look similar to the following:
Received: from 2008DC.2007Exchange.internal ([fe80::7493:a258:e51c:58ee]) by
2008DC.2007Exchange.internal ([fe80::7493:a258:e51c:58ee%10]) with mapi; Wed,
2 Dec 2009 12:33:38 -0800
While internal message headers on 2003 are completely blank. This reveals the underlying Exchange processing change made in 2007 that triggers this behavior.