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Recently, we've had an issue with emails just disappearing to a specific domain.
The logs confirm that they are sent out, but admins on the other side claim they don't ever see a log of the email ever hitting their server.
Our mail server is the only server they have these sorts of problems with.
This is the only instance of this ever happening.
An NSLookup of the domain in question on the email server proves the target MX records are as they should be.
I could successfully telnet into the target server over port 25.
There aren't any bouncebacks, or any indication that the email has been lost.
Anyone have any experience with this kind of issue?