[Dovecot] Different passwords for different IP-Addresses/protocols?

Hi,

I'd like to do the following:

Have an IMAP server, avaible

• at localhost 127.0.0.1 without SSL for local clients and web based applications such as squirrelmail

• from outside with SSL for mobile users

but - for security reasons - would like to use different passwords on both ports.

How could I achieve that?

regards Hadmut