Dovecot virtual and SASL with Postfix

[Jerry]

This is my first attempt to set up virtual users and sasl with Postfix.

Can I use a regular password file in this format:

user:{plain}password
user2:{plain}password2

or do I need to use a different format? I have been trying to find an example
of a virtual user SASL file, but without any luck. I suck at Googling too.

All of the mail will be delivered to :/var/mail/vmail/<domain>/<user>

-- 
Jerry