HELP PLEASE. im getting the 451 4.4.0 dns query failed for every domain. We can not send any outbound emails out. they are all sitting in the queue.
The company got a ransom ware virus, and in the process of correcting everything they restarted the Exchange server, thats when they noticed that they could not send emails to external addresses.
I feel like it has to be something simple im missing that will start sending everything once fixed. something with resetting the DNS? I know i have limited information to go off of. what other information is needed?
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