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mail-address-semantics/workplans/MAS-WP-0004-postfix-integration-profile.md
tegwick 1c0fcce69d MAS-WP-0003: finished; MAS-WP-0002 gate decided; residuals MAS-WP-0004..0007 
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Assistant: claude-code
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2026-10-18 14:09:21 +02:00

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id type title domain repo status owner topic_slug created updated origin origin_ref
MAS-WP-0004 workplan MAS Postfix integration profile communication mail-address-semantics proposed claude coulomb-social 2026-10-18 2026-10-18 residual MAS-WP-0003

MAS Postfix integration profile

Decision-gate outcome of MAS-WP-0002 (founder, 2026-10-18). MAS-WP-0003 showed that a default Postfix silently drops every P2 (!) address, and that the correct relay configuration is not obvious (docs/experiment-review.md, operational findings). Turn the working setup in deploy/railiance/entrypoint.sh into a documented, tested integration profile.

Extract the profile

id: MAS-WP-0004-T01
status: todo
priority: high

Write a standalone Postfix profile (main.cf/master.cf fragments plus the relay regexp) for a MAS receiving domain:

  • explicit @DOMAIN relay regexp, ending the restriction list in reject;
  • allow_untrusted_routing=yes, swap_bangpath=no and allow_percent_hack=no;
  • pipe to mas-gateway;
  • optional authenticated relay with a send cap;
  • null-sender discard. Explain each setting and say why the stock config fails.

Probe the profile

id: MAS-WP-0004-T02
status: todo
priority: high

Extend experiments/postfix-probe/ to run the profile against the full address corpus. Include the relay negatives (x@other, x!y@other, a@other@DOMAIN, a@DOMAIN@other) and P2 forms. Make it part of the test suite where Docker is available.

Exim notes

id: MAS-WP-0004-T03
status: todo
priority: low

Check whether Exim has equivalent pitfalls for !/% local-parts and record the needed settings. Build an Exim profile only if there is demand.