- **htmlVersion**: html version of the message
- **textVersion**: text only version of the message
- **additionalMailHeader**: additions to the smtp mail header
+- **sent**: default false, if set to true in the hook, the default mailer will be skipped.
### emailer_send
Called before calling PHP's `mail()`.
- **subject**
- **body**
- **headers**
+- **sent**: default false, if set to true in the hook, the default mailer will be skipped.
### load_config
Called during `App` initialization to allow addons to load their own configuration file(s) with `App::loadConfigFile()`.