What’s a PTR record (reverse DNS) and why is it important?

• PTR records are critical for email legitimacy:
• What they prove: The IP owner has configured a meaningful hostname. Not a random residential IP or compromised machine.
• Filter impact:
• Missing PTR: Many receivers reject outright or heavily penalize.
• Generic PTR (like 192-0-2-1.isp.com): Looks like residential/dynamic IP. Spam signal.
• Proper PTR (like mail.tidalmail.com): Legitimate server indication.
• Best practice:

• PTR should reflect your brand or mail function
• Forward DNS should resolve that name back to the same IP
• Professional configuration is a baseline expectation for bulk senders.

A registered ship name proves it belongs to a legitimate fleet, not a pirate vessel with no papers.