It is now possible to use SASL authentication with IRC server, using two mechanisms: "plain" (default) or "dh-blowfish" (crypted password).

New options have been added to servers:

• sasl_mechanism: mechanism to use ("plain" or "dh-blowfish")
• sasl_timeout: timeout (in seconds) for authentication
• sasl_username: username
• sasl_password: password

You just have to setup username (your nick) and password (password of nick) and then connect to server, you'll be identified with SASL if all is ok.

If you want to set "dh-blowfish" by default for all servers:

/set irc.server_default.sasl_mechanism dh-blowfish