Hello, I had the the same problem.
I solved it with this description: https://b4d.sablun.org/blog/2019-02-25-dovecot_2.3_upgrade_on_debian/ The change shold be done in /etc/dovecot/conf.d/10-ssl.conf Kind regards -- Mechtilde Stehmann ## Debian Developer ## PGP encryption welcome ## F0E3 7F3D C87A 4998 2899 39E7 F287 7BBA 141A AD7F
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