The settings for the e-mail configuration are:
Host Name: smtp.gmail.com
Port Number: 587
Next, you MAY need to disable CAPTCHA for your Gmail account. CAPTCHA is the Gmail feature that forces you to type in the letters before you can continue. Sometimes, the Gmail server responds with a CAPTCHA challenge. Since lab is unable to process this challenge CAPTCHA needs to be disabled to allow Lab to use Gmail SMTP ae the e-mail configuration.
For additional information click on the following links.
To disable CAPTCHA on your Gmail account: