You can now send virtually unlimited emails in Gmail. It works by connecting a third party SMTP service like SendGrid, Mailgun, or Mailjet to your GMass account.

The advantages of this setup are:

The ability to send virtually unlimited emails in Gmail and avoid Gmail's sending limits.
No risk of a Gmail account being suspended by Google.
The disadvantages of this setup are potentially:

A slight decrease in deliverability, although from our testing, we've found the open and reply rates using SendGrid as the SMTP server to usually be just as high as sending natively from Google. See our deliverability database to do real-time comparisons.