spfquery.mail-spf-perl(1p) on Linux
The text a787f44eb8d3, as Debian 8 (Jessie) shipped it.
(Mail::SPF) - Checks if a given set of e-mail parameters matches a domain's SPF policy
Flags it lists
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--authorize-mxes-for -
--def-exp -
--default-explanation -
--fallback -
--guess -
--hostname -
--keep-comments -
--local -
--max-dns-interactive-terms -
--max-name-lookups-per-term -
--no-keep-comments -
--override -
--tfwl