Soren The symptom of getting a "imapd-ssl: No supported cipher suites have been found." message might be configuration related.
I have a business client that decided to upgrade their mail server on their own this last weekend. It didn't go well for them and they had to call me. They had this same error. I looked in my notes from a few years back when I was doing some other courier upgrades (in 201604xx) and found something related to this which fixed my client's problem and it might fix yours. Check your courierd config file. If you have "TLS_TRUSTCERTS=/usr/lib/courier/rootcerts", comment that out. Add "TLS_TRUSTCERTS=/etc/ssl/certs" I remember seeing your bug a week or two ago. Check this and see if it helps. If it's not related, my apologies.
