I'm a little late to this party, but…

Here's a couple of examples of well-known domains that "fail" my check:

  warn
    condition = ${if and{{def:sender_host_address}{!def:sender_host_name}}\
                      {yes}{no}}
add_header = X-Host-Lookup-Failed: Reverse DNS lookup failed for $sender_host_address (${if eq{$host_lookup_failed}{1}{failed}{deferred}})


        cambridgejazz.org

        thegreatcourses.com

        localsecrets.com

        mbna.co.uk


and that includes real user account emails, not just marketing spam.


apols for the late reply.

cheers,
calum.

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