I ran our domain through MXToolbox, and this error comes up several times: "Reverse DNS does not match SMTP Banner".

We use G Suite for our email and Cloudflare for DNS. Can I fix these warnings from MXtoolbox? Since I obviously don't run the SMTP server (Google does), I'm thinking these aren't fixable.



They're saying that your forward lookups (A) don't match your reverse lookups(PTR). Talk to your ISP, they can edit them or give you the tools to do it.

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  • The addresses in question belong to Google. – Harry Johnston Jun 6 '18 at 19:39

Those are warnings not errors right?

It would implicate to many drawbacks on a working protocol to have this required.

Discussion here too: Do internet standards require reverse DNS for every device?

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