Transactional email on Cloudflare

Emails must look like they were manually written by a person, not designed by a marketing team. Build them as plain HTML template strings, send them through the Cloudflare send_email binding, and always preview them in light + dark mode before shipping.

Every email MUST set a reply_to

Sending subdomains (like tommy.akarso.co) usually have no MX or A records, so replies to the from address silently bounce — while the email copy actively invites replies ("just reply to this email"). Every send, whether via the send_email binding or the cloudflare SDK, MUST include a reply_to.

Rules: