> I think the problem is that my imap server is using TLS. Is that "diagnosis"
> correct? How can I fix it?

I have has the same problem with SquirrelMail and your same configuration (postfix+dovecot).
It started working when I set PLAIN authentication method without TLS.

Maybe, it works also for roundcube.

Thank you Yusef, but I don't want to disable TLS for security reasons. BTW, I have mynetworks set to 127.0.0.0/8 in /etc/postfix/main.cf, so secure authentication should be disabled for RoundCube...
Any ideas?

Daniele

--
~Yusef
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