You can use G Suite infrastructure to send e-mails from printers, applications and other e-mail enabled appliances.
I want to send e-mails only internally
Sender address: email@example.com
SMTP server: ASPMX.L.GOOGLE.COM
SMTP port: 25
Note: You need to have configured correct sender address, otherwise generated e-mails will not be delivered.
I want to send e-mails internally and externally
In this case we recommend to configure Gmail SMTP Relay service in Admin Console.