On 27 Nov 2019, at 00:15, Wesley Peng <postmas...@wsly.de> wrote:
> -exists:%{ir}.spf.rambler.ru

That expands to if the IP address (reverse check) plus /spf/rambler.ru exists…

So, of you see a connection from 1.2.3.444 and 1.2.3.444.spf.rambler.ru exists, 
pass the spf check.



-- 
Fairy Tales are more than true; not because they tell us that dragons
        exist, but because they tell us that dragons can be beaten.

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