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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.

Thanks!

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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
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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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