Migrated account to new server, now it does not receive emails from accounts on old server

Hello, We have two whm servers, lets call them "Standard" and "Premium", we had a cpanel account on Standard server, i used the transfer tool to transfer it to premium server, then we updated all the dns entries etc... old account on standard server was then deleted. Transferred account on premium server can send and receive emails normally, except emails from accounts on the standard server. Checking the mail troubleshooter we get the following "virtual__user to local delivery" We did a dns cleanup on standard server and used the troubleshooter again and this time we get "lookup via mail.xxxxxxx.com [xx.xx.xx.xx] MX=10 dnssec=no" but still, transferred account does not receive emails from old server. tracking delivery of email gives the following response Delivery Event Details

Event:	success alt="success">https://host.codendot.com:2083/cPanel_magic_revision_0/cjt/images/icons/success.png
User:	yyyy
Domain:	yyyy.com
From Address:	user@yyyy.com
Sender:	user@yyyy.com
Sent Time:	Mar 6, 2020, 9:56:09 AM
Sender Host:	standard.serveryyy.com
Sender IP:	::1
Authentication:	dovecot_login
Spam Score:
Recipient:	recep@xxxx.com
Delivery User:	-remote-
Delivery Domain:
Delivered To:	recep@xxxx.com
Router:	lookuphost
Transport:	remote_smtp
Out Time:	Mar 6, 2020, 9:57:09 AM
ID:	xxx7qN-0000lU-Ex
Delivery Host:	mail.xxx.com
Delivery IP:	95.xxx.xx.107
Size:	577 bytes
Result:	Accepted

Any idea what we are missing,