Module verify 

Sioul’s own checks of who sent a message: SPF, DKIM, DMARC, ARC and the reverse DNS of the server that handed it to your provider, done when the message is fetched, through the system’s DNS (Stalwart’s mail-auth).

Some providers record no checks (a shared host may write only a spam score), and those that do differ. The results are written on top of the stored message as an Authentication-Results header (RFC 8601) under Sioul’s own name for this installation (config::sioul_authserv_id), which the Porch trusts first. Checking when the message arrives also matters: DKIM keys rotate, and some signatures expire within days.

Structs

Verifier

Constants

CHECKS 🔒

The longest one message’s checks may take: DNS can be slow, never blocking.

Functions

verify_folder

Checks every message of a Maildir that Sioul has not checked yet (with again, every message, its earlier results replaced), and writes the results on top of it, in place. Returns how many were checked.

write_private 🔒

Mail written yours alone, as it was fetched (maildir::store): not readable by the other accounts of a shared computer, whatever the umask.