Personally I think that it's not a "free tool" if you charge for it, even at 50 or 500 emails a month, to me it's a paid service with a "free tier". For exampl

Personally I think that it's not a "free tool" if you charge for it, even at 50 or 500 emails a month, to me it's a paid service with a "free tier". For example I would never generalise Amazon AWS as "free hosting".