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I second on #3. There should be a quick link to log in and remove reminders.

Also very curious, what is the monetization strategy here.

Doesn't seem like a business; more of a web app.

But maybe a small ad at the bottom of each e-mail?

That idea has crossed my mind but you need a lot of users to make it viable.

No strategy yet. Just solving a problem and it doesn't cost me anything yet.