One of my users provided me with a warning message she'd received with the fatal error ResponseCode 421, 4.7.0 Temporarily Deferred. This was in response to an email she was sending me, another zoho user, both of us using the same domain.
I can see there was an issue back in 2015 with spammers using zohomail, and throttling the IP address 74.201.84.163.
Is this a repeat of that issue? Is there anything we should be doing on our end?
Thank you,
Elijah
P.S. Thank you again for your prompt response and repair of an earlier issue we'd experienced with the search bar in zohomail.