Hi!
Does the duplicate sieve plugin do any locking to avoid duplicate parallel delivery of the same message?
I sometimes experience duplicate mail delivery of messages with the same message-id, despite the use of a sieve duplicate filter. According to the log files, those messages are delivered in the same second by two parallel dovecot-lda processes. (Duplicate filtering works fine in all other cases.)
RFC7352 states that the ID of a message may only be committed to the duplicate tracking list at the _end_ of a successful script execution, which may lead to race conditions. Maybe I am running into this?
Is there an easy way to serialize mail delivery using some locking inside sieve?
Or do I have to serialize per-user dovecot-lda delivery? Any experiences with that?
I am using dovecot-2.2.25 and pidgeonhole-0.4.15. Mail is delivered using postfix-2.10 and dovecot-lda as mailbox_command. Mailbox format is maildir with LAYOUT=fs.
Cheers, --leo
e-mail ::: Leo.Bergolth (at) wu.ac.at fax ::: +43-1-31336-906050 location ::: IT-Services | Vienna University of Economics | Austria