MailBug lets you send email without a “computer”, and it's still running

A friend mentioned this to me the other day and I think it's a cool piece of Internet history. It's still operational and I wonder how many people are using it. The fee is $15.95 per month. It has an associated YouTube channel from a few years ago: https://www.youtube.com/channel/UCrF0GuFv5Rgc2M8llAeMdEg