# E17006 — ReceiveRuleLimitExceeded

The mailbox already has the maximum of 200 receive rules. Delete rules you no longer need, then retry.

- **HTTP status**: `422`
- **Type**: `validation_error`
- **Name**: `ReceiveRuleLimitExceeded`

## What to do

The request body parsed, but one or more values are invalid. Read the `details` array: each entry names the failing field (`param`, a dotted path like `to[0].email`) with a human-readable reason. Fix the named fields and retry.

## Related

- [E17xxx — Agent mailboxes](/docs/api/errors/E17xxx): every code in this range
- [Errors](/docs/api/errors): the full wire contract, status mapping, and error catalog
- [Error handling](/docs/guides/errors): branching on `type` and `code`, validation details, and `vendor_code`