The calendar fan-out probes every shared/group account on suspicion,
because Stalwart does not always advertise calendar capability on group
accounts. A shared account that grants no calendar access at all rejects
that probe - and did so again on every calendar interaction: each range
change re-queried the account and logged a red console error
("You do not have access to account X") while working fine otherwise.
Remember the rejection instead: the thrown query error now carries the
JMAP error type, an access rejection for a probed secondary account is
logged once at debug level, and both fan-out loops (events and calendar
lists) skip the account for the rest of the session. Genuine failures on
the primary account keep the error log. Two regression tests cover the
probe-once behavior and the calendar-list skip.
dealerweb
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