Alexander NAZARIAN via dmarc-discuss wrote on 2021-05-18 20:40:
Different online SPF checkers show different results.
> [...]
>
So, looks that mailbox providers count MX mechanism as 1 lookup (no
matter how many hostnames MX record resolves to) and dmarcanalyzer.com
<http://dmarcanalyzer.com> tool lookup check have nothing with reality,
Could you help with understanding how many DNS queries are being run for
the MX mechanism ?
You've shown two different interpretations of the SPF specification. To
me, which of these is the correct interpretation is of less importance
than the fact that both interpretations exist. If high deliverability is
desired, it's thus wise to comply with the more strict interpretation.
In the concrete example, the "mx" mechanism is redundant to
"include:_spf.google.com" and can be omitted.
Regards,
Matt
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