Problems after upgrading to 2.3.2.1

[Timo Sirainen]

On 22 Nov 2018, at 22.28, Joel Dahl <joel at vnode.se> wrote:
> 
> Hi,
> 
> I've just upgraded dovecot from 2.2.35 to 2.3.2.1 on my mail server
> and noticed something odd. My mail clients (mutt and Apple mail) both stopped
> seeing new mail in my mailboxes.
> 
> For example, ~/Maildir/mailinglist1/new has 5 new mails. In mutt, vieweing the
> list of mailboxes mutt reports 0 new mail for "mailinglist1". Opening up the
> actual mailbox in mutt reveals the 5 new mails. Going back to the list of
> mailboxes, mutt now correctly reports 5 unread mails. Waiting a few hours, and
> about 10 new mails have arrived, but mutt still says 5 unread.
> 
> This is the same for every mailbox. As a test I deleted the index files for a
> specific mailbox and restarted dovecot. But it didn't help. I use procmail to
> deliver my mail into the Maildir folders, if that matters.

See if mailbox_list_index=no helps? Or switch to delivering via dovecot-lda (just tell procmail to deliver using it).