Cloudflare Email Sending is transactional, not marketing bulk

Cloudflare Email Sending (Workers send_email binding or REST) is transactional — receipts, password resets, one-off lifecycle mail. Marketing and multi-thousand blasts are out of scope.

Bulk sends hit E_RATE_LIMIT_EXCEEDED / E_DAILY_LIMIT_EXCEEDED (or silent rejects) after a small successful prefix. Check GET /accounts/{id}/email/sending/limits before a large send. Use a dedicated ESP for campaigns.

Docs: Email Service. Related: tech-cloudflare-workflows-reset-on-code-update.