We have a website that sends email using php mail function and sendmail. We frequently get email rejected response emails from several destination email servers saying that we have an issue with our ptr record.
The mx record for the websites domain name points to the google mail servers and works fine for sending and receiving mail in smtp/pop clients.
When doing a reverse lookup using nslookup the ip does not resolve to any domain name.
Note: There are multiple websites hosted on the same server using the same ip address, and the servers MAIN domain name is serv1.rhinoagile.com
but when the website uses sendmail to send out email we get the resposne mentioned above about the reverse dns issue.
My Question: Can I... ?
can I leave the mx records as they are and add a ptr record resolving the websites ip address to serv1.rhinoagile.com (because the IP is used for multiple sites, I don't want to have the ip reverse to any specific websites domain name)
Not an option...
Configuring the website to use smtp is not currently an option. It is not currently built into the cms platform, and I do not have approval to add the ability to use smtp to the cms at this time
If you are famillilar with digital ocean, It would be nice if you could also advise me on how to do it in their interface, otherwise I will just google it.