#ssh -X username@hostname

Once logged in, run the command whose GUI you want displayed on mac. If you get an error message like below:

“X11 connection rejected because of wrong authentication.”

Follow the steps defined here.
(Basically, you need to make sure that ~/.Xauthority is owned by you and that “grep X11Forwarding /etc/ssh/sshd_config” shows that X11 forwarding is enabled.)

However, note that setting the email address alone may not work. While ReadyNAS has built in (embedded) SMTP server, your firewal or ISP may block emails from the embedded SMTP server. So make sure to send a test message after setting the email address. If the alert message arrives, you are done. Other wise move on to configure remote SMTP server.

I set up the remote SMTP server to be gmail. As per the google web page regarding configuration of mail clients (found here) following SMTP setting are needed:

Outgoing Mail (SMTP) Server – requires TLS or SSL: smtp.gmail.com (use authentication)
Use Authentication: Yes
Port for TLS/STARTTLS: 587
Port for SSL: 465

Fortunately, ReadyNAS supports TLS. So next step is to click on SMTP tab, and fill in the information. Set  server to smtp.gmail.com, SMTP port to 587, User and From should be your gmail email address, password should be your gmail account password. Leave “Login Type” to auto and check TLS and STARTLS. Apply  the changes. (See image below).

Finally, go back to the “Contacts” tab and double check that alerts work by sending a test message. It should.

Once alert messages are working, you can go “Settings” tab and configure when the alert emails should be sent.

Note that other than alerts,  this email setup can also be used to recover the password in case some day you find that you have forgotten the admin password. Good luck!