Typically, Google displays a warning on any of your mail-service transactional messages, giving away the “secret” of your automated system. A Constant Contact example:
Enable Solve’s new “Outgoing Email Service” add-on to dispatch your transactional (automated) Solve messages using your own email system. This regains the feeling of a personal touch in your message … just as if you typed it yourself.
This unique feature increases the trust level of the messages, substantially reducing the possibility that your automated emails will be filtered or rejected as spam. Transactional messages become visible in your Sent folder, and Google presents the emails to the recipient as if you typed and sent them normally.
4 February 2015, 7:00 am