## mailfront

# Plugin: rbl

This plugin looks up the remote IP of the client in a list of RBLs, and blocks all messages if it is listed.

## Configuration

`RBL_BLACKLISTS`
  The list of RBL domain names to search, separated by commas (`,`). If this list is empty, no action is taken.
`RBL_DEBUG`
  If set, this plugin will provide extra output which may be useful in diagnosing RBL issues.
`RBL_QUEUEDIR`
  If set and the client is listed on one of the listed RBLs, capture the message into the named directory and then reject instead of rejecting earlier. See the `queuedir` backend for more details on settings (prefixed by `RBL_`).