I'm getting ready to do the same thing. I have been on the look-out to find a strong way to get messages out to our users. We are in the process of streamlining how to best communicate for our district, so for now, emails that get forwarded and an internal website have been my main points of communication.
The first obstacle for me was getting my content forwarded, and the next was getting users to actually read it. My last messaging was a few weeks before school ended, but was by far the best received. For reference, it was the second time I had used this format.
I used Smore, which is free and after 50 views (I think) I started to get the analytics on the "flyer" I created. I'd say that the reviews were really positive, and for the time of year I was pretty impressed by the views it was getting. Smore made it really easy to make clear messaging and the templates look great.
We posted a link to the flyer on our internal site, and used a screen shot of the flyer, along with the link in the email. I liked the simplicity, and that the email could be quickly scanned for content then forwarded, and users following the link would give me the data.

Here is a link to the flyer
Although this worked well, I have only created a few flyers and I know that at some point I would need to pay to continue to use it. I'm curious to see what everyone else has been using, Smore is easy to use, but I'm not in love with it or anything.
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