454 5.7.1 DXNS3 220.127.116.11: Message refused. Your host name dosen't match with your IP address: EX1SERVER.domain.local If you need, please contact firstname.lastname@example.org.
We have been getting mail bounced back from a lot of outside mail servers. To fix it, I have removed the SPF record but don't think that is the issue.
We asked our ISP to change the PTR record for 18.104.22.168 to reflect as mail.domain.com.
Why do outside servers see us as EX1SERVER.domain.local if we have changed the PTR to show as the mail.domain.com address?
I looked here but didn't have direct info regarding my issue: