This is a perfect response. I'm biased towards SendGrid as I work there :) You can totally do exactly what OP wants. Use the inbound parse webhook, get mail fo

This is a perfect response. I'm biased towards SendGrid as I work there :) You can totally do exactly what OP wants. Use the inbound parse webhook, get mail forwarded to your HTTP webhook/endpoint, do whatever you want, and then you can even reply using the email API of the provider. No reason to sweat the mail server stuff.