Resolution
Occasionally an incoming message may have fewer recipients than intended.
The incoming transaction log has the following line:
Message will be cross-post merged against these message IDs:<outmailid,outmailid>
Listmanager has a feature to combat email fatigue. Email fatigue is the result of sending irrelevant content and/or mailing too frequently. In this case, Listmanager detects if an email address was already sent exactly the same email. If so the cross-posting does not allow the exact same message to go to the same email address more than one time within 24hours. Cross-posting applies to an email address across any list in the Listmanager server.
