Did a couple of things which solved the issue.
First, I discovered that the M1XEP has defaulted to its default IP address (192.168.0.251). How did I discover this? Using "Find Me" button on RP.
Second, I changed my laptop IP to 192.168.0.250 to match this M1XEP default IP address (so I can connect using RP). Once changed, I can now get connected to M1XEP.
Third, once connected, I changed the static IP address to what it was. I also changed SMTP server to smtp.comcast.net ; port to 587 ; username to
[email protected] & my password. I finished this stage by pressing RP->M1 button.
Fourth, for testing, I didn't use the "Test" button from Email tab. Rather, I setup a new rule that will send an email every 30 seconds. Saved. Send to control.
At this stage email is flowing every 30 seconds. Once I'm satisfied that it is working as it should, I deleted this rule.
Hope this will help others who also facing the same problem.