Shoutbox

First go to your gmail inbox go to settings(near email id on top) > Fowarding and POP3 and configure it.

Now enter the information in MP!L.

Edit: Make sure you enable it and use this info.

Incoming Mail (POP3) Server - requires SSL:      pop.gmail.com
Use SSL: Yes
Port: 995

Outgoing Mail (SMTP) Server - requires TLS:     smtp.gmail.com (use authentication)
Use Authentication: Yes
Use STARTTLS: Yes (some clients call this SSL)
Port: 465 or 587

Account Name:     your Gmail username (including '@gmail.com')

Email Address:     your full Gmail email address (username@gmail.com)

Password:     your Gmail password