(a single) local Exchange 2010 installation on Windows Server 2008 R2
AV: GFI MailEssentials 2012
A user today complained about not having received an email. I've replaced the addresses but you get the picture. The only reason we caught this one is b/c there was a second recipient inside our organization who did receive the mail.
The user is part of the "office" mailing list. I checked the message tracking and indeed, the mailing list is missing and none of the users in that list received the mail. Only the second recipient, a single user, received it and can be found in the tracking:
If the recipients would be missing altogether ok, but can someone riddle me how one recipient is visible in the Outlook email history of our user but not in our message tracking?