550 5.7.25: Gmail: sending IP needs reverse DNS (PTR record)
Gmail requires the sending IP address to have a matching reverse DNS (PTR) record.
Rejected by policy or reputation
What 550 5.7.25 means
Google's documentation says the IP address sending the mail must have a PTR record. Without it Gmail rejects the mail as likely unauthentic.
Common causes
- No reverse DNS set up for the sending IP
- A PTR that does not match the server's hostname
How to fix it
- Ask your hosting or IP provider to set a PTR record for the sending IP
- Make the hostname resolve back to the same IP
What to do with the address
Not an address problem. Fix the server configuration.
Check an address now with the free email checker, or look at a domain's mail setup with the email domain checker, MX lookup and SPF checker.
Related error codes
Frequently asked questions
- What does 550 5.7.25 mean?
- Gmail requires the sending IP address to have a matching reverse DNS (PTR) record. Google's documentation says the IP address sending the mail must have a PTR record. Without it Gmail rejects the mail as likely unauthentic.
- Is 550 5.7.25 a hard bounce or a soft bounce?
- Rejected by policy or reputation. It is usually about the sender, not the recipient.
- What should I do with the address after 550 5.7.25?
- Not an address problem. Fix the server configuration.