I tested roundcube 0.22 and 0.3rc1, I found no way to connect to my smtp/tls.
I tried tls://localhost, but I have something like :
SMTP send: NOT OK(Connection failed: Failed to connect socket: fsockopen() [<a href='function.fsockopen'>function.fsockopen</a>]: unable to connect to tls://smtp.****.com:25 (Unknown error))
when I click on "test" (during the configuration process).
Please help :)
I can connect to the server without any problem with my mail client (evolution, the default gnome mail client) both for smtp (25) and imap (143) with TLS.
was running into a similar error... check config file for correct user/pass for your smtp server, I'm using %u / %p to use same creds that user logged in with.
Hope this helps someone!