Mail 10.3 for macOS Sierra Version 10.12 How to Send/Receive Email
The settings on this page show how to send and receive email on Mail 10.3 (macOS Sierra 10.12).
How to Receive/Send Email Messages
Receiving Email Messages
Click Get Mail.
Sending Email Messages
Click New Message.
Create an email, and click Send.
If you are sending a test email, enter your own email address in the To section to send it to yourself.
Then, check to see if the test mail has been received to confirm the settings are configured properly.