Does Magento 2 SMTP Email Extension Support Third-Party Mail Services?

Yes, Magento 2 SMTP Email Extension supports many popular mail services like Gmail, Amazon SES, SendGrid, and Mailgun. In Magento 2 SMTP Email Extension you only need to set the SMTP host, port, username, and password. Once the connection test passes, all your store emails are sent via the same SMTP, which greatly improves the email delivery success rate.

Check out more details at: http://webkul.com/blog/smtp-configurator-magento2/