In our company we host our own exchange mail server, and this sends mails from our internal IP. The DNS PTR record is configured for this and everything gets delivered.
We also have some web applications externally hosted that send emails. These keep getting stuck in spam filters and I've been told a DNS PTR record needs adding.
Both services send from the same domain name, but from 2 very different IPs.
From what I have read here (Is it bad to have the reverse DNS for two IPs point to the same domain name?) and here (Why multiple PTR records in DNS is not recommended?) it sounds like simply adding a second record with the web IP may cause issues. At the same time this seams like a fairly standard set up so if anyone can let me know the best way to set this up it would be great.