---
description: Subaddressing, also known as plus addressing, is now supported in Email Routing.
title: Subaddressing support in Email Routing
image: https://developers.cloudflare.com/changelog/post/2025-07-21-subaddressing/og.png?v=1ecf32593979bcf1
---

[Skip to content](#main-content)

[View RSS feeds](https://developers.cloudflare.com/fundamentals/new-features/available-rss-feeds/) [ Subscribe to RSS](https://developers.cloudflare.com/changelog/rss/index.xml)

[Back to all posts](https://developers.cloudflare.com/changelog)

July 21, 2025

## Subaddressing support in Email Routing

[Email Service](https://developers.cloudflare.com/email-service/)

Copy as Markdown| [View as Markdown](https://developers.cloudflare.com/changelog/post/2025-07-21-subaddressing/index.md)| [Agent setup](https://developers.cloudflare.com/agent-setup/)

Subaddressing, as defined in [RFC 5233 ↗︎](https://www.rfc-editor.org/rfc/rfc5233), also known as plus addressing, is now supported in Email Routing. This enables using the "+" separator to augment your custom addresses with arbitrary detail information.

Now you can send an email to `user+detail@example.com` and it will be captured by the `user@example.com` custom address. The `+detail` part is ignored by Email Routing, but it can be captured next in the processing chain in the logs, an [Email Worker](https://developers.cloudflare.com/email-service/api/route-emails/email-handler/) or an [Agent application ↗︎](https://github.com/cloudflare/agents/tree/main/examples/email-agent).

Customers can use this feature to dynamically add context to their emails, such as tracking the source of an email or categorizing emails without needing to create multiple custom addresses.

![Subaddressing](https://developers.cloudflare.com/cdn-cgi/image/onerror=redirect,width=1316,height=678,format=webp/_astro/subaddressing.x65bljxx.png)

Check our [Developer Docs](https://developers.cloudflare.com/email-service/configuration/email-routing-addresses/#subaddressing) to learn how to enable subaddressing in Email Routing.

```json
{"@context":"https://schema.org","@type":"BlogPosting","@id":"https://developers.cloudflare.com/changelog/post/2025-07-21-subaddressing/#page","headline":"Subaddressing support in Email Routing","description":"Subaddressing, also known as plus addressing, is now supported in Email Routing.","url":"https://developers.cloudflare.com/changelog/post/2025-07-21-subaddressing/","inLanguage":"en","image":"https://developers.cloudflare.com/changelog/post/2025-07-21-subaddressing/og.png?v=1ecf32593979bcf1","dateModified":"2025-07-21","datePublished":"2025-07-21","publisher":{"@type":"Organization","name":"Cloudflare","description":"One platform for your apps, agents, and workforce. Build, secure, and scale without managing infrastructure","url":"https://www.cloudflare.com/","sameAs":["https://github.com/cloudflare","https://www.linkedin.com/company/cloudflare","https://x.com/cloudflare"],"logo":{"@type":"ImageObject","url":"https://developers.cloudflare.com/logo.svg"},"address":{"@type":"PostalAddress","streetAddress":"101 Townsend St","addressLocality":"San Francisco","addressRegion":"CA","postalCode":"94107","addressCountry":"US"},"contactPoint":[{"@type":"ContactPoint","contactType":"Customer Support","url":"https://support.cloudflare.com/","availableLanguage":["English"]},{"@type":"ContactPoint","contactType":"Sales","url":"https://www.cloudflare.com/contact/","availableLanguage":["English"]}]},"isPartOf":{"@type":"WebSite","@id":"https://developers.cloudflare.com/#website","name":"Cloudflare Docs","url":"https://developers.cloudflare.com/"}}
```