dovecot: TLS logins not working with default configuration
Starting from dovecot version 2.2.34, TLS logins are failing with the following error message:
Fatal: Unknown ssl_protocols setting: Unrecognized protocol ‘SSLv2’
Libressl does not support SSLv2, but dovecot assumes the contrary because macro SSL_TXT_SSLv2 is defined. Manually setting the ssl_protocols option resolves the problem.
(from redmine: issue id 8611, created on 2018-03-06, closed on 2018-03-24)