Yes this is possible, here is what I had to do to send mail from a gmail server:
Add the following parameters with the following values in the Site Configuration tab:
MAIL_SERVER_PORT ''465''
SMTP_AUTHENTICATION ''Y''
SMTP_SSL_SUPPORT ''Y''
Then click the settings button and select ''Set Mail Protocol''
Select SMTP server and put in the following values:
SMTP server ''smtp.gmail.com''
User Name ''The gmail email address that you want to use to send mail''
Password ''Password for the gmail account above''
Admin Email ''This is the email address that you want to be displayed in the ''from'' in QC emails''
Use TLS checkbox ''make sure this is checkbox is NOT selected''
Note: in the test emails the email is always sent from the current logged in QC user, MAKE SURE THE USER THAT IS
CURRENTLY LOGGED INTO SITE ADMIN HAS AN EMAIL ADDRESS ASSIGNED TO THEIR USERNAME OR THE TEST EMAIL WILL FAIL.