One primary member per mailbox

Shipped: 26 ஆகஸ்ட், 2026 அன்று 8:19 PM UTC
Author: Kamo
Commit: 96fdf9d

is_primary was unique per member only, so two members could both claim a mailbox — and PrimaryMailboxIdentityLookup returns null on an ambiguous address, so that address then authenticated neither of them.

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