[Email Routing] Update limits (#17122)

* Update limits.mdx

* Update src/content/docs/email-routing/limits.mdx

Co-authored-by: hyperlint-ai[bot] <154288675+hyperlint-ai[bot]@users.noreply.github.com>

* Update src/content/docs/email-routing/limits.mdx

Co-authored-by: hyperlint-ai[bot] <154288675+hyperlint-ai[bot]@users.noreply.github.com>

---------

Co-authored-by: Kim J <[email protected]>
Co-authored-by: hyperlint-ai[bot] <154288675+hyperlint-ai[bot]@users.noreply.github.com>

Author: 3 people

src/content/docs/email-routing/limits.mdx

@@ -28,3 +28,7 @@ Currently, Email Routing does not support messages bigger than 25 MiB.
 | [Addresses](/email-routing/setup/email-routing-addresses/#destination-addresses) | 200   |
 
 <Render file="limits_increase" product="workers" />
+
+## 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.