How to configure Supabase to send emails from your domain

I wonder if the "Connect to Supabase" option surfaces the rate limits shown in the manual SMTP config. Those are pretty useful, but if the defaults are actually 3 emails per hour and 60s between emails, I'd say it's important to show them to the user upfront to avoid confusion.

The sliders on the pricing page are weird. It shows me $200 per month for 300k email or 650k emails. Why have all the 50k increments in between with the same price?

This isn't specific to the one here, but I hate the way these services are priced. I don't want a bucket of use-it-or-lose-it service. That's just opaque way of overcharging while making the customer feel like they're getting good value at the top end IMO.

Charge me a base rate, then per-email, and adjust the discount according to my volume.

> If you exceed your plan limits, you will be notified and given the option to upgrade to a higher plan. If you don’t upgrade and repeatedly exceed your plan, your account may be temporarily deactivated.

Why? I realize it's the way everyone does it, but it's dumb. Why should I come back and beg to use the service more? Let me put up a bond (ex: $2500) that determines my monthly rate limit (ex: 1,000,000) to prevent abuse, then stop bugging me and charge my credit card for my consumption every month.

I also wonder if Supabase has configurable fallback SMTP providers. I'd love to use AWS SES for volume and a managed provider like this one as a fallback.