Smore has been a favorite of mine for the last 4 years. I started using this newsletter service in my classroom to communicate with parents and now use it for my tech tips.
I like to use Smore because first of all, it is pleasing to the eye to read. No one wants to read a boring newsletter with no color. Just as a kid will usually pick a book by its color, so will some parents read a whole newsletter based off of its appearance. Having a good template and design will grab your audience and allow them to focus better on what you have to say.
The second reason I like to use Smore is because it is electronic and can be accessed on smartphones and devices. Most parents have a device and check their email on a regular basis. In most cases, parents will read a newsletter on their phone, rather than finding the hard copy newsletter that their son or daughter may have brought home.
Lastly, Smore is a great choice because it ease of creating a newsletter. No more worrying about your margins, columns, or picture sizes! Smore does all of that for you.
Of course a tool like this is never free. Smore just reduced its educator plan to $39/year, this is over a $200 value. Check out the Smore educator pricing here.