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MX-NO-PTR

MX host without reverse DNS

What it means

Receivers look up the PTR of connecting servers; missing or generic reverse DNS is a strong spam signal and some providers refuse the connection outright.

How to fix it

  1. 1Ask the hosting provider to set a PTR for the server IP matching its hostname.
  2. 2Make sure that hostname resolves back to the same IP.

Re-check after the change

DNS changes can take up to the record's TTL to be seen; use Re-run on the result page to bypass our 10-minute cache.