[Dovecot] Per IP ssl certificates

I have to manage 2 different domains, with 1 ssl certificate each, but I don't know how to configure them.

I tried this example: "Different certificates per IP and protocol" http://wiki2.dovecot.org/SSL/DovecotConfiguration

but I got this error: doveconf: Fatal: Error in configuration file /etc/dovecot/dovecot.conf: ssl enabled, but ssl_cert not set

I dont find any documentation about the 'local' keyword too.

Any idea or tip?

Thanks

-- Simone Caruso IT Consultant p.iva: 03045250838