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Check if an IP address is allowed to send an e-mail from the specified e-mail address
spfquery
Query Sender Policy Framework records to validate e-mail senders.
More information: <https://www.libspf2.org/>.
Trick copyright:
tl;dr; <
https://github.com/tldr-pages/tldr
>
spfquery -ip {{8.8.8.8}} -sender {{
[email protected]
}}
click the source code to copy
install
spfquery
on any operating system with
command-not-found.com