Symptom
Sending email to name@domain.com returns a 554-Bad DNS PTR resource record.
Steps to Test
Perform a SMTP test using mxtoolbox.com
Root Cause
Emails from the email server are rejected because the PTR Resource Record (PTR-RR) of the IP address does not exist. Possible reasons for this can be:
- The PTR-RR states that the IP address was dynamically allocated
- The PTR-RR is a generic standard which needs to be allocated to an independent and fully qualified domain name (Fully Qualified Domain Name - FQDN) to the email server and enter the corresponding valid PTR-RR
- Individual rejection of the PTR-RR for system protection reasons.
Steps to Resolution