(a single) local Exchange 2010 installation on Windows Server 2008 R2
AV: GFI MailEssentials 2012
The message tracking on our Exchange only shows one of the recipients for an email (as opposed to 2 in the header info) (and that one with a different TLD than in the header, we use both .de and .eu though), i.e. one of the recipients seems to have been dropped somewhere along the way. I was gonna treat it as an isolated incident but we now had this happen twice with different senders (that we know of).
The header shows: email@example.com; firstname.lastname@example.org
and here's the tracking (email@example.com is a distribution list with only the user firstname.lastname@example.org in it):
Now I realize that the header information is not reliable but nevertheless, this was a legitimate email and the sender did initially send the mail to those two addresses in our organization and I need to troubleshoot this problem. Any ideas? Of course, I sent some test mails but the problem seems to occur sporadically.
( My initial question on this matter can be found here: