Email Prevent and IronPort as downstream MTA

Is anyone else seeing issues in DLP version 12.x with corrupted emails to recipients.  I am hearing that IronPort is "Cleaning" Bare CRLFs out of fragmented packets before reassembling them, which is breaking the message header.

Proposed solution is to change a setting in IronPort to NOT clean BARE CRLF.

Want to understand the risk in doing so.

Thanks,

Bob.