Reverse DNS pointer record

[Dangerousdave26]

First I know the rDNS/PTR record has to be set by the server host. My question is in my environment what name should that DNS setting have.

Server hostname = Bob.ThisDomain.org

Accounts on this Server
ThisDomain.org
ThatDomain.org
MyBestFriendSite.net
TheGuyIreallyDontlike.net

The rDNS/PTR right now is set to mail.thatdomain.org

I seem to be having issues sending email from some thatdomain.org to yahoo/AT&T. I have followed their guides to be more compliant but I question my rDNS setting.

[overseer]

If you want to PM me your actual domain, I could do some outside testing with dig. Otherwise, there are various online DNS testing tools if you want to DIY.

[6Sense]

Hostname should have a DNS A record eg: A - bob - your IP

You should also update your RDNS on the server host to bob.thisdomain.org if its currently pointed to mail.thisdomain.org

[Dangerousdave26]

Thank you both for your help. I opened a ticket to get the rDNS PTR changed and they have already done it. Now i just need to wait for the change to make its way through the dns system.

[6Sense]

Cool stuff! 

Be sure to check your mail DNS settings now that your host name is bob.thisdomain.org. There are different ways to set it up but I've listed what I prefer below for you.

mail - A - your IP
webmail - A - your IP
imap - CNAME - thisdomain.org
pop - CNAME - thisdomain.org
pop3 - CNAME - thisdomain.org
smtp - CNAME - thisdomain.org

Lastly ensure you have DMARC, DKIM & SPF set up correctly. These are necessary for many large email providers now. You can check to see everything is good here https://mxtoolbox.com/