I get what you mean by this! Let me clarify what my way of thought is behind the "completely free, no strings attached". I do not ask for your credit card info, I don't put you on a trial that magically renews at the end of the month, I don't offer you a sketchy sign-on deal with an unexpected bill at the end of the month. I try to make it as ethical as possible, unlike some other marketing/emailing tools.

That is my meaning behind no strings attached. Of course I put some features behind a subscription because they demand significant work from my side (managing the domains is one of those).

I was confused by this. How is the email sent for free customers? From your domain? If so, that seems like a totally different (and worse, generally) thing than the competitors you list. It's fine to have a free tier, but then you can't really compare it to those competitors.

Write all that as bullet points on the website itself