#PTR record

Tagged: PTR record

07 Jul 2026Sam wallness

PTR Records and Reverse DNS: Why Your Mail Server Needs a Matching Hostname

PTR records map an IP address back to a hostname — and receiving mail servers check them on every inbound connection. Without a correctly configured PTR record and forward-confirmed reverse DNS, your messages pick up a reputation penalty before content is even evaluated.

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Why Your Sending IP Needs a Reverse DNS Record (And How to Set One Up)

SMTP & Infrastructure

13 Jun 2026Sam wallness

Why Your Sending IP Needs a Reverse DNS Record (And How to Set One Up)

A missing PTR record triggers Outlook to reject your mail with a 550 error. This guide explains what reverse DNS is, why mailbox providers check it, and how to configure forward-confirmed reverse DNS for your sending IP.

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