determine why mail clients download mails 2nd time

Poliman - Serwis serwis at
Mon Nov 26 10:01:18 EET 2018

I have strange problem. In last Friday I had a problem with dovecot. It
didn't see directories with mailboxes in /var/vmail. Somehow it crashed
because probably two things (a lot of this type of lines in mail.err file):
*Nov 23 07:05:02 s1 dovecot: lda(poli at <poli at>): Error: User
initialization failed: Initializing mail storage from mail_location setting
failed: mkdir(/var/vmail/
<>) failed: Permission denied (euid=5000(vmail)
egid=5000(vmail) missing +w perm: /var/vmail, dir owned by 0:0 mode=0755)*
and maybe

*Nov 12 09:27:59 s1 dovecot: imap(artur at
<artur at>): Error: Corrupted index cache file
<>: Broken MIME
parts for mail UID 559 in mailbox INBOX: Cached MIME parts don't match
message during parsing: Cached header size mismatch (parts=)Nov 12 09:27:59
s1 dovecot: imap(artur at <artur at>): Error:
<>) failed: No
such file or directory (in mail-cache.c:28)*

and after this event probably all mailboxes download again all emails from
1.11 to 22.11. They were duplicated in mail clients.

*Pozdrawiam / Best Regards*
*Piotr Bracha*
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