Mobile Friendly Communications

We sent out our first monthly newsletter. Two questions:

What is the best way to "preview" before sending to constituents?  Can you preview mobile vs desktop versions?


When I looked at newsletter on mobile device, it looked rather small print.  Is there a specific size & font to use so mobile version is easy to read? In our previous software, we could see how many opened via mobile vs desktop and majority was mobile devices. So this is critical.


Also, I see on our main page the # attempted to send and the # delivered, it would be nice to see an open rate as a percent.


Thanks for help,

Theresa