It will be great to see an authenticated tier and the pricing for it, I would want to add SPF and DKIM records but wouldn’t want anyone with access to workers to be able send emails from my domain
For a general guide to our pricing, check out https://www.mailchannels.com/pricing/. There isn't a way yet to send authenticated mail via the Cloudflare-oriented API; however, that will come. Paid users will get access to our console, click tracking, open tracking, priority support, etc.
It’s exciting!! It will be interesting to see if this product can be further expanded into Cloudflare Workers so that you can process inbound emails in workers for custom logic / storage and maybe also handle outbound email delivery from workers