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Hello, My business uses an On-Prem Exchange Server 2016 on Windows Server 2016 for email. Some of our users are in regular communication with the branches of the US military. Recently, one of our users noticed that we aren't receiving email from military email addresses. Other users have confirmed this suspicion. There are no issues with email delivery with any other email hosting providers such as gmail. Any help would be greatly appreciated
Are the senders getting NDRS ( Bouncebacks?)
Do those messages show up in your message tracking?
I am going to ask my users about the bounce back emails. I checked the logs for the front end receive connector, but I was unable to find any messages from ".mil" addresses
So that's the key point. If those messages arent making it to you, then its up to the sender to prove your org accepted it in their logs.
if a NDR exists, then even better.
Having said all that, does Exchange accept mail directly from the internet or is there a SMTP gateway that accepts it first, then routes to Exchange?
I just checked and there weren't any NDRs received by the senders.
Our firewall has an anti-spam feature, but I couldn't find any emails from military that were intercepted. Other than that, it is just the Exchange server
Ok, so if you can't find any records of receiving these messages, you need to ask the sender to check their logs and see if your org accepted the message. That's the only option if all your log checking is coming up empty.
I know you checked the protocol logs but did you also check:
https://learn.microsoft.com/en-us/exchange/mail-flow/transport-logs/search-message-tracking-logs?view=exchserver-2019
to ensure you didnt miss anything?
it seems unlikely that all the military orgs would be unable to send to you unless there is something going on with your mail system that isnt obvious.
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Hi,
Which log of receive connector did you check? It should be Default Frontend <ServerName> or the one if you created to replace Default Frontend.
If you can't find any clues in Message tracking log and Protocol log, and it's not rejected by firewall, you should contact the sender side to confirm if the message is sending succesfully.
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I am writing here to confirm with you how the thing going now?
If you need further help, please provide more detailed information, so that we can give more appropriate suggestions.
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