[Dovecot] Error "Initializing mail storage ..." after upgrading to 2.2.10

[Joseph Tam]

G?tz Reinicke writes:

> mail_location = mbox:~/:INBOX=/var/mail/%u
> ...
> Namespace inbox: type=private, prefix=, sep=, inbox=yes, hidden=no,
> list=yes, subscriptions=yes
> location=mbox:~/:INBOX=/var/mail/rechnungseingang-animationsinstitut
> Feb 27 17:02:11 imap(rechnungseingang-animationsinstitut): Error: user
> rechnungseingang-animationsinstitut: Initialization failed: Namespace
> '': Home directory not set for user. Can't expand ~/ for mail root dir
> in: ~/:INBOX=/var/mail/rechnungseingang-animationsinstitut

Hmm, I don't have a trialing '/' in my mail_location, so maybe
you can try leaving it off too just to check.

 	mbox:~:INBOX=/var/mail/%u

Also, is your home directory well defined in your userdb?  Check output
of

 	doveadm user rechnungseingang-animationsinstitut

Joseph Tam <jtam.home at gmail.com>