Akonadi POP3 does not try to authenticate anymore

Hello.

Anyone ever got this? Excerpt from Dovecot POP3 log:

Jul 22 21:11:38 mondschein dovecot: pop3-login: Aborted login (no auth attempts in 0 secs): user=<>, [… IPs …]
Jul 22 21:11:38 mondschein dovecot: pop3-login: Aborted login (no auth attempts in 0 secs): user=<>, [… IPs …]

This just happened out of a sudden here.

In ~/.xsession-errors I see this:

kdeinit5: Got EXEC_NEW '/usr/lib/x86_64-linux-gnu/qt5/plugins/kf5/kio/pop3.so' from launcher.
kdeinit5: preparing to launch '/usr/lib/x86_64-linux-gnu/qt5/plugins/kf5/kio/pop3.so'
kdeinit5: Got EXEC_NEW '/usr/lib/x86_64-linux-gnu/qt5/plugins/kf5/kio/pop3.so' from launcher.
kdeinit5: preparing to launch '/usr/lib/x86_64-linux-gnu/qt5/plugins/kf5/kio/pop3.so'
kdeinit5: PID 4352 terminated.
kdeinit5: PID 4353 terminated.

Seems the pop3.so instantly terminates.

This is in kf5-kdepimlibs-kio-plugins 4:16.04.2-2

QT is 5.7.1, KDEPIM is 16.04. KF is 5.28. OS is Debian GNU/Linux Sid.

Any idea?

(I´d need to figure out how else to read my mail tough as Akonadi refuses to
receive them at the moment. I am currently really fed up with errors like this.
It worked for such a long time, now it fails for no apparent reason.)

Thanks,
-- 
Martin