I am a bit confused about PTR records and how to set it up correctly.
This is the current setup:
A website: domain.com, on this website I have a mailaddress info@domain.com. On domain.com I have an iframe which shows a questionaire, this questionaire is hosted on otherdomain.com.
At some point in the questionaire users will get a confirmation mail from the sender info@domain.com which is sent from a mailserver at smtp.otherdomain.com.
- On domain.com I have added the IP for smtp.otherdomain.com in my SPF record.
- On domain.com I have a PTR record set to the IP of the server it is hosted on
- On otherdomain.com there is a PTR record set to smtp.otherdomain.com
In most cases sending mails goes fine, however last week I got this message: 550 inconsistent or no DNS PTR record for << The IP of otherdomain.com >>
The mails did not end up in the inbox of '@freenet.de' mail accounts.
How can I fix this?