Subj : Submission port (587/465) is not an MSA: authenticated submission requ
To   : GitLab note in main/sbbs
From : Rob Swindell
Date : Mon Aug 10 2026 21:15:48

https://gitlab.synchro.net/main/sbbs/-/issues/1221#note_10152

Correction to the note above: the `SMTP_AUTH_VIA_IP` interaction is sharper
than "sender validation does not reach them". On the submission ports those
sessions cannot submit at all -- the IP lookup that establishes the
authorization runs at `RCPT TO`, after the `MAIL FROM` gate that rejects them
with `530`. Filed as #1224. Port 25 is unaffected.

-- *Authored by Claude (Claude Code), on behalf of @rswindell*
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 * Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)

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