i did the changes for opelhistorics.be (a domainname added under a username)
and gives this:
https://mxtoolbox.com/SuperTool.aspx?action=mx:opelhistorics.be&run=toolpage#
and gives this:
https://mxtoolbox.com/SuperTool.aspx?action=mx:opelhistorics.be&run=toolpage#
so here you see the switching back220 gsi2.opelmanta.be ESMTP Exim 4.92 Sat, 23 Mar 2019 00:13:00 +0100
Test Result
SMTP Banner Check Reverse DNS does not match SMTP Banner