I'm looking for the signup, but I can't find one. So I tested what would happen if I just followed the example and send myself an email. That worked flawlessly. The redirect didn't work in Postman, as it was a "TM-finalURL" header instead of a Location header.

But... this allows me to use your site to send whatever message I want to whomever I want. There doesn't seem to be any rate limiting (I stopped after sending myself like 10 mails).

Isn't this kind of bad?