My company uses an outside vendor for sending eblast notifications to our public user base, one of which is a daily newsletter. This past week, some of our internal users have stopped receiving this newsletter, but it appears at random for who is not receiving.

I've brought up logs from my firewall, GWIA, POA and MTA, and can follow the message coming in through the firewall, gets passed through the GWIA and displays the "queuing to MTA" message, then I can no longer follow the message. We do have GWAVA performing a GWIA scan, and I'm wondering if that has anything to do with it, as I was able to identify that only the messages from a specific server in the vendor's bank is having this problem.