Once we finished our initial email and our second one to learn how to attach a file I pretty much let the students correspond on their own. I didn't correct for spelling or punctuation but encouraged them to communicate independently. Some of them managed to log on from home and showed their families. Some surprises were the trouble with capital letters and all caps, misspelling of target email addresses, and hitting send multiple times. Overall it was a blast! I wasn't sure the students could log on and send emails by themselves but they did remarkably well!
The lesson is posted here.