All right. Can you please help me on this issue?
SSL_accept() failed: error:0A000416:SSL routines::sslv3 alert certificate unknown: SSL alert number 46
I took a command you (Ilia) had given in a post many years ago here - Email clients not accepting new Letsencrypt R3 CA certificate used in dovecot/postfix email servers - #5 by Ilia
openssl s_client -connect mail.example.com:993
and ran that command. It gives this error, among other things - BAD Error in IMAP command received by server.
Further, when i run this command - journalctl -u dovecot
it throws up this error - imap-login: Error: Failed to initialize SSL server context: Can’t load SSL private key (ssl_key setting>
pop3-login: Error: Failed to initialize SSL server context: Can’t load SSL private key (ssl_key setting>