[Dovecot] [dovecot] Getting duplicates when using snarf plugin with mbox backend

[Jonathan SIegle]

Running dovecot version 2.0.11. To reproduce, open two imap sessions and issue a check command from each at the same time with new mail in the queue.

0 login testuser testpw
1 select inbox
-- Deliver mail --
2 check

Thanks,
Jonathan

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