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Link: https://forum.qnapclub.de/thread/41435-howto-letsencrypt-plex/

https://www.heise.de/ct/ausgabe/2013-17-Raspberry-Pi-als-privater-LAMP-u...

SSL Zertifikat in /etc/dovecot/conf.d/10-ssl.conf
ssl_cert =

http://pc-berater.biz/2016/10/06/loesung-something-wrong-with-the-volume...

run the following
get-receiveconnector | fl name,max*

look at the maximum message size settings for your connectors

you can run the following to increase all
get-receiveconnector | set-receiveconnector -maxmessagesize 20MB