What can be the issue for the below error?
Question asked by Kunal Mayekar - 11/21/2019 at 3:04 AM

Could not deliver message to the following recipient(s):

Failed Recipient: abc@xxxxx.com

Reason: Remote host said: 601 Attempted to send the message to the following IPs:

      xx.xx.xx.xx, xx.xx.xx.xx

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Alex Clarke Replied
We experienced the same issue and it seems to have improved by upgrading to the latest version and also changing DNS servers.

We’re now in the process of rolling out new custom DNS servers to improve things further. 

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