Am evaluating SM for possible implementation into our small ISP.
So running latest greatest build from last night 16.3.6543 on Windows Server 2016
Have run into an issue during my evaluation where one domain (on a different server) whenever they try and send mail to my SM device, they almost instantly get a response "No such user here".
The mailbox DOES exist they are trying to send to, and if I send to it from a different domain (on yet a different server) the mail goes right through without an issue.
Just looking for things I can check with the one failing domain.
Has to be something missing in configuration of the server itself or in the sending domains DNS, but not sure what all things SM is looking for that could produce the "No such user here" message.
Thanks for any insight!