E-mail tool is the utility that allows to send e-mails from the router. Tool can be used to send regular configuration backups and exports to network administrator.
Email tool uses only plain authentication and tls encryption. Other methods are not supported.

All data that you need is here:

Server:   74.125.136.108 [smtp.gmail.com] <- you can't use hostname
Port:     587
From:     <your name> <- nice name
User:     <gmail username> <- without @gmail.com
Password: <gmail password>

Configuring this tool is very simple, all you need to do is fill your data as shown in the picture

or you can do this in one step from the terminal:

/tool e-mail set address=74.125.136.108 from="<your name>" password=<gmail password> port=587 start-tls=yes user=<gmail username>

This is all you need to do… next time I will write some usage example. If you have some your example, you can leave it in a comment ;)