The imap plugin linked to until now (https://gitlab.com/comzeradd/radicale-imap) is not compatible with 3.0 anymore, while the original plugin from UnRud was updated: https://github.com/Unrud/RadicaleIMAP
This is quite nasty, because you don't even get a useful error message with debug level logging... just a 500 server error on login attempts.
The imap plugin linked to until now (https://gitlab.com/comzeradd/radicale-imap) is not compatible with 3.0 anymore, while the original plugin from UnRud was updated: https://github.com/Unrud/RadicaleIMAP This is quite nasty, because you don't even get a useful error message with
debug
level logging... just a 500 server error on login attempts.