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Resolved DNS MAIL.DOMAIN - not a valid Hostname

JohnnyU

Basic Pleskian
I have a VPS from Leaseweb and on the IP there i set the Reverse DNS Name to my domain.com
The domain is hosted with namecheap and i use Plesk to manage the hosting but BIND DNS is not installed

When i check on http://mxtoolbox.com i get a strange warning: 'mail.domain Reverse DNS is not a valid Hostname' but i have not set a MAIL.DOMAIN in namecheap DNS so where is this coming from!

All i have as DNS records are mailbox pointing to IP, www pointing to IP and @ pointing to IP. For mail i have only MXE pointing to IP. So clearly no mail.domain but i can browse to it and i get to my domain o_O


EDIT: Found the problem, it seems that choosing the MXE option - pointed to my IP makes a (invisible) mail.domain dns record
So i removed the - MXE record - (Mail Easy) is used to forward mail to an IP address of a mail server - and made an MX record pointed to my domain
 
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