Limits

Email Workers size limits

When you process emails with Email Workers on the Workers Free plan, your Worker may exceed its CPU or memory allocation and fail with an error. This is more likely with large emails or complex processing logic. Refer to Worker limits for more information.

You can use the log functionality for Workers to look for messages related to CPU limits (such as EXCEEDED_CPU) and troubleshoot any issues regarding allocation errors.

If you encounter these error messages frequently, consider upgrading to the Workers Paid plan for higher usage limits.

Message size

Currently, Email Routing does not support messages bigger than 25 MiB.

Rules and addresses

Each rule maps one custom email address (like info@yourdomain.com) to one destination address or an Email Worker.

Feature	Limit
Rules	200
Addresses	200

Need a higher limit?

To request an adjustment to a limit, complete the Limit Increase Request Form ↗. If the limit can be increased, Cloudflare will contact you with next steps.

Email Routing summary for emails sent through Workers

Emails sent through Workers will show up in the Email Routing summary page as dropped even if they were successfully delivered.