IoT: Gmail for Things

Sending mail from a printer, scanner or app - Google Apps Administrator Help:
You can set up your on-premises multifunction printer, scanner, fax, or application to send email through Google Apps. The three available options are: SMTP relay service, Gmail SMTP server and Restricted Gmail SMTP server.

SMTP: smtp.gmail.com
Port 465 (SSL required)
Port 587 (TLS required)
2000 Messages per day.

What Are the Gmail SMTP Settings? - About Email