On 17 Jul 2019, at 22.13, Jos Chrispijn via dovecot <dovecot@dovecot.org> wrote:

On 16-7-19 9:30, John Doe Vecot via dovecot wrote:
Lately I get some errors in my logfile, saying:
dovecot[72337]: auth: Warning: Event 0x1280fe20 leaked (parent=0x0): auth-client-connection.c:338: 1 Time(s)
Same overhere; can someone pls explain?

What's your doveconf -n? I suppose this is coming either when stopping/reloading, or maybe auth process stops when it's been idling for 1 minute. Do you use Postfix/Exim (or something else) that authenticates via Dovecot?