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This is great! Thank you.

There is also https://forwardemail.net/ which is a different service.

Was just about to post this. I've been using it from the beginning for all of my "pre-launch" domains and it has been flawless.

I also use forwardemail.net and pay for premium. It's fantastic, although I haven't made use of the APIs yet so can't speak to that.

Also anonaddy.com which provides better privacy at 1$/month for custom domains.