Connect unlimited sites to single free Gmail account
Allows your users reply to a free Gmail email address from your site
Send email from HTTP sites
Generally, you cannot send email from HTTP sites. However, you can tunnel to another HTTPS site and send email.
Send email from localhost sites
For testing purposes, you can send email from a site that is on a computer not connected to the internet.
One email, many sites
You can run multiple sites with one email!