Facing the issue as "Domain of sender address does not exist"
Problem reported by Kunal Mayekar - 1/30/2020 at 2:16 AM
Could not deliver message to the following recipient(s):

Failed Recipient: abc@abc.com
Reason: Remote host said: 553 #5.1.8 Domain of sender address <xxx@xyz.com> does not exist 

Please update on the issue

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Sébastien Riccio Replied
This shows that the remote server you're sending mail to is rejecting your e-mail because the sender domain doesn't exists.

Check your "from" domain name, maybe it's mispelled or you are trying to send mail from an unexistant domain name.

Sébastien Riccio
System & Network Admin

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