Alan McGinlay wrote:

Can't believe I'm the only one with this error, googled it and there is
nothing. Sorry to whine but I am getting desperate here!

I googled "safe_mkstemp permission denied" and first hit is this thread

        dovecot.org/list/dovecot/2010-August/052319.html

which mentions this error coming about from chrooting users.  Looking back
on your post, I see

        http://www.dovecot.org/list/dovecot/2013-December/093900.html

        mail_chroot = /var/vmail

As long as your desperate, maybe try leaving this setting empty?
(This doesn't explain why it's not deterministic though.)   Try
process traces -- I do when I'm stumped.

Joseph Tam <jtam.h...@gmail.com>

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