Roundcube multiserver IMAP and SMTP settings

Hi, this is kinda n00b question, but it can save me hours of googling.
I´m trying to install Roundcube on my multiserver setup, but i dont know what exactly to set to IMAP and SMTP or what do I have to change in dovecot setting, to make authenting secure.
Thanks.

 

ok, I found out, I have to login with my email account, which I previously created in ISPC webinterface email> email mailboxes.
But how can I send SMTP php mail () if i don´t have my domain under my mail server, but under google apps. I can´t just create [email protected] because its under google apps. Now I´m address of another domain hosten on my server.

 

Server: ssl://mail.mydomain.com:465
Port: 465
User: [email protected]
Password: passs123

Trying to send email...
SMTP send: NOT OK(Connection failed: Failed to connect socket: Connection refused)

if I don´t use ssl, everything works fine, but I guess it´s not secure, what do I need to change?

 

thank you, ssl is working now