I need some assistance from the community.
I reported an issue on a ticket and it started with a single client. They were sending to us fine a week or so ago until I upgraded to the latest MAPI builds. Now I am on 7429.
Please check your SMTP logs for a single day if you have a lot of volume, search for "RSET"
Then once you have your log file open, CTRL+F in the browser to search and search for "Barracuda" and see if you have all inbound emails sent via a Barracuda gateway/anti-spam? server being RSET. We are not receiving any emails from anyone using Barracuda.
I checked my domain/IP and made sure we were not on any black lists. All looks good. So I am really concerned because my clients are eventually getting unable to deliver messages and we are not receiving important emails. People are getting frustrated.
Thanks for your help!