| Name | Type | Description | Notes |
|---|---|---|---|
| type | string | The matching strategy for this rule. `email` blocks an exact sender address, `domain` blocks all senders at a domain, `destination` blocks an exact recipient address, and `startswith` blocks any sender whose local-part begins with the given prefix. | |
| data | string | The value to match against, interpreted according to `type`: a full email address for `email`/`destination`, a domain name for `domain`, or an alphanumeric prefix string for `startswith`. | |
| user | string | Optional SMTP username of the mail order to associate this rule with (e.g. `mb20682`). If omitted the first active order is used. Valid usernames are the `username` values returned by `GET /mail`. | [optional] |