Updates an inbound route. Omitted fields are unchanged; the `domain` is immutable. Cross-field rules are validated against the merged result, so an update that leaves the route inconsistent (such as `deliver_to_mailbox` without a target mailbox) returns `422`. Disabled routes are kept but skipped during evaluation. How the route matches recipients. Possible values: `address`, `catch_all` The local part an `address` route matches. Null for `catch_all` routes. What happens to matching mail. `deliver_to_mailbox` delivers it to `target_mailbox_id` (required); `drop` discards it silently, with nothing stored and no webhook fired. Possible values: `deliver_to_mailbox`, `drop` The mailbox that receives matching mail. Null for `drop` routes. Evaluation order — lowest number wins. Explicit routes accept 11–1000; the mailbox's own address always matches at priority 10. Whether the route is evaluated. Inbound route ID. The domain the route applies to. How the route matches recipients. `address` matches one local part; `catch_all` matches every recipient on the domain that nothing else matched. Possible values: `address`, `catch_all` The local part an `address` route matches. Null for `catch_all` routes. What happens to matching mail. `deliver_to_mailbox` delivers it to `target_mailbox_id`; `drop` discards it silently, with nothing stored and no webhook fired. Possible values: `deliver_to_mailbox`, `drop` The mailbox that receives matching mail. Null for `drop` routes. Evaluation order — lowest number wins. Explicit routes accept 11–1000 (default 100); the mailbox's own address always matches at priority 10. Whether the route is evaluated. Disabled routes are kept but skipped. When the route was created. When the route was last updated.