I do not need a solution (just sharing information)
Im trying to fix a problem a client have , we cannot receive emails from one domain and it started some days ago..before it was working.
I can find this on Symantec cloud spam log : Response: 454 4.7.5 [internal] verify error:num=21:unable to verify the first certificate:depth=0:/CN=xxxxxxx
Server = exchange 2013 Version 15.0 (Build 1263.5)
We can send to them
No changes has been made to the server in 3m ,
Can the problem be on the senders side ?
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