Zoho IP is either rejected or marked as anauthorized on destination servers

Hi, I use zoho email for my domain name email account that is set up on the DNS of my domain name provider. Not on my website's hosting server.

I had to change my hosting provider a few weeks ago, and I remade the settings for my zoho account

I realized though that after changing the hosting company my zoho domain name account that is still set up on the DNS with the new settings, is rejected or marked as anauthorized from some servers.

The DKIM is set up correct and as result the DNS setup too and I don't get any warnings on my email account neither on the DNS account.

But I can't sent either emails to some certain domain name emails that are hosted on different servers. In other words my email is rejected from three different hosting servers and three different domain name email accounts that are hosted on different servers that are located in different areas.

The message that I get on the returned emails is the following.

Domain email 1 hosted in Singapore

xxxxx@xxxxxxx.com INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :Verification failed for xxxxxx@xxxxxxxxxxx.com>
			No such person at this address.
			Sender verify failed

Reporting-MTA: dns; mx.zohomail.com
Arrival-Date: Sun, 8 Mar 2020 13:23:42 +0200
Original-Recipient: rfc822; xxxxxxx@xxxxxxxxxxx.com
Final-Recipient: rfc822; xxxxxxx@xxxxxxxx.com
Status: 550
Action: failed
Last-Attempt-Date: 8 Mar 2020 11:24:37 GMT
Diagnostic-Code: xxxxxx@xxxxxxxx.com INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :Verification failed for xxxxxxxxxx@xxxxxxxxxx.com>
			No such person at this address.
			Sender verify failed

Second email account hosted on a French server

xxxxxx@xxxxxxxxxxxxxx.com INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :Verification failed for <xx@xxxxxxxxxx.com>
			No such person at this address.
			Sender verify failed

Reporting-MTA: dns; mx.zohomail.com
Arrival-Date: Sun, 8 Mar 2020 13:23:42 +0200
Original-Recipient: rfc822; xx@xxxxxxxxxxx.com
Final-Recipient: rfc822; xxxxxxxxxxxxxx@xxxxxxxxxxxxxx.com
Status: 550
Action: failed
Last-Attempt-Date: 8 Mar 2020 11:24:37 GMT
Diagnostic-Code: xxxxxxxxxxxxxxxxx@xxxxxx.com INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :Verification failed for <xxxxxxxxxxxx@xxxxxxxxxxxxxx.com>
			No such person at this address.
			Sender verify failed

The third email account didn't reject the message but gave us the following warning. ( see the attachment)

The matter is that the ip that is recorded and graylisted in the attachment file is neither mine, neither the DNS provider;s, nor my internet's provider.

It is an American ip probably a zoho's one that it isn't blacklisted or graylisted anywhere.

So in order to conclude. We can't figure out why my domain name email account that is setup in zoho is rejected from three different email accounts that are hosted on three different servers while there is no problem with the setup, the servers and the ip itself in order to figure out where is the problem and fix it.

Can you figure out what is the problem?