Looking for MX Records Matching Post from Linkers

Saw a post on Linkers about how to match MX records in the past week and lost it. Anyone remembers it?

John M.
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might be talking about LeadMagic. They show you the MX provider wih their email validation feature.
Marina G.
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Yes! That must be it. Thank you!!
Jonny C.
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also free with EmailGuard
John M.
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Jonny C. EmailGuard does show some of this, but LeadMagic's is more defined. I ran a large test comparing the two. EmailGuard is legit tho! That guy is cooking something up.
Jonny C.
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what is more defined?
John M.
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EmailGuard might mark something as Unknown and LeadMagic will say something like SpamBlaster3000, as an example
John M.
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if you take 100 email addresses and run them through both and look at the results youll see what im talking about
Jonny C.
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not sure, never had an unknown return from EG before
John M.
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my bad i was thinking of Custom Mail Server
👍🏻1
Mike R.
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There’s a bunch of free mx record look up API’s, can filter by those before running validation.
John M.
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can you share some of them you know of Mike R.?
Mike R.
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https://dns.google.com/resolve?name={domain}&type=MX if you google mx record lookup api there are quite a few free ones out there 👍
Jonny C.
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doesn't postmaster provide them?