Can DLP be used to prevent email from a specific domain from being forwarded?

[sdonovan123]

Hello,

I am wondering if DLP be used to prevent email from a specific domain from being forwarded?

Shawn

[Ken Stieers]

If you mean inbound mail, no.  Its only applied to Outgoing messages.

If you mean messages received from domain x, and then forwarded by your users, maybe... Depends on your DLP app.

You may be able to do it with a content filter as well...

[David Miller]

As the other answer says DLP only applies to outbound mail, and typically is used to look at email content not just the metadata (from, to, etc).  You could try tagging the incoming email from the specific domain with an x-header (e.g. X-DoNotForward) and then in your outbound filter look for that header and reject any emails or bounce them back to the sender with a notification message.  You do not need DLP to do this. 

[Ken Stieers]

Adding a "do not forward" header is actually a pretty elegant solution.  The email system you use may be able to act on that header as well (I know Exchange 2010 can)