To be clear, Cloudflare Email Service is not a full-blown email provider like Fastmail, nor is it even comparable to email services like AWS SES or SendGrid. Cloudflare already offered email routing and Cloudflare Email Service just adds the ability to send email via Cloudflare Workers, so there’s a long way to go before Cloudflare could be an option for replacing Fastmail.

What would be the difference if we are talking about transactional emails? Why not comparable to SES?

You know, it might be closer to AWS SES and SendGrid than I thought initially. My first reading of blog post gave me the impression that Cloudflare Email Service was designed for Cloudflare Workers only because that’s what they emphasized upfront. But I missed this piece:

> We’re also making sure Email Service seamlessly fits into your existing applications. If you need to send emails from external services, you can do so using either REST APIs or SMTP.

> This really irks me.

It shouldn't.

They are not launching a complete emailing service, this is just a service that you use to send emails from an app.

"Moving" to their service is as easy as updating your DNS records so they can be seen as an authorized sender.

That's nothing. One of the recent CloudFlare outages was because they hosted some essential stuff at Google cloud and that had an outage