I must say this is a very awesome newsletter plugin as compared with others. From what I have discovered so far. As to creating newsletters I find it a bit buggy... Let me explain:
Creating a short news letter two post seems to work fine, but the auto saving doesn’t work 100% of the time, not even 50%. You have to go back to the main newsletter post and then start over to see if it saved.
If you copy a sent newsletter you cannot edit it no matter what you do! Even tried this by copying a copied one, same result.
If you create a larger newsletter more than 4 post (including pictures) some items or formating is saved and others are not. This includes links, pictures (with links), formating (layout) and adding post. I have tried the F5 key as another way to check if the newsletter has been saved with failure. It pops up every few minutes telling you that is has saved newsletter, but does not save. Which makes creating a newsletter a waste of time, as you will need to start over... with failure of and uncompleted newsletter.
I understand it is still under development and other features are coming or improving. but if you are creating a newsletter with more than 3 items seems like a waste if it tells you it is saving and does not.
It imports CSV files, just fine and creates groups great as well, but no names even when you format your file as requested.
As for sending and formatting only tested with 10 emails and works fine on all devices and apps. This was with the first newsletter (short) and the larger ones (uncompleted, not saved).
The creation and saving function makes it hard to give this a full OK.