cyrus-imap 2.5.3 - `lost' messages
Michael Menge
michael.menge at zdv.uni-tuebingen.de
Tue Aug 14 03:38:09 EDT 2018
Quoting Dirk-Willem van Gulik <dirkx at webweaving.org>:
> On a smal cyrus imap 2.5.3 setup (freebsd ports, default settings,
> 5k users, 300 Gb mboxes) we are seeing very sporadic `loss' of
> messages (once every few months; 1 or 2 messages; out of a few 100k
> to a million going through perfectly fine in the same period).
>
> They disappear; but are still present as a /var/spool/imap/user/X/12345.
> files.
>
> But cannot be found; even when searching through IMAP on message-ID
> or otherwise unique elements. Searches in the same veign for the
> messages before/after the lost one work and return those.
>
> A grep through the cyrus.index shows its unique message ID.
>
> A full reconstruct with /-r/-R/-G does not seem to bring it back as visible.
>
> The mesaages lost are otherwise normal; fully valid mime; and when
> re-injected - pass through and surface.
>
> What is the right way to debug this ? We suspect it may have
> something to do with either (al)pine and thunderbird; as it seems to
> hit users that mix those two clients - during periods they use both.
> All else seems normal.
Do you use delayed expunge mode (man imapd.conf see expunge_mode)?
If yes, "unexpunge -l user/X" will show you the mails that have been
deleted but are still on the disk.
You will also see the time the mail was deleted.
Regards,
Michael Menge
--------------------------------------------------------------------------------
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