Asked for by John, 2026-09-19. Public ihasmail is Stalwart-facing and knows
nothing about INBUXA, so running an unmodified one against the migrated
server checks something the fork's own suites cannot: that a client written
for upstream still works.
Each difference it finds is one of two things, and the point is to say
which: a regression against upstream's contract, which the fork's tests
would not catch because they test the fork; or a feature that now expects
INBUXA's own front ends, which belongs in the contract and the release
notes rather than in a user's surprise.
After mail is flowing, not as a gate. It informs the contract; it doesn't
block a cutover.
jcoffey-dev
f338ddf57d