Recommended Protocols?

Hello all:

For several years I have been running the following in a Linux server.

Dovecot Version: 2.0.9

*IMAP:* Connection Security: SSL/TLS Port: 993 Authentication Method: Normal Password

*SMTP:* Connection Security: STARTTLS Port: 587 Authentication Method: Normal Password

The E-mail client is Thunderbird on Windows.

I am preparing a new server, with Dovecot 2.2.36 and would like to know the currently recommended protocols. Should I stick to what I have? I would prefer to start with the easiest configuration possible, which I will revise later.

This is the command that I have been using to verify the server's functionality:

% openssl s_client -connect localhost:imaps

TIA