## Rails 4.0.0 (unreleased) ##

* Allow to set default Action Mailer options via `config.action_mailer.default_options=` *Robert Pankowecki*

* Raise an `ActionView::MissingTemplate` exception when no implicit template could be found. *Damien Mathieu*

* Asynchronously send messages via the Rails Queue *Brian Cardarella*

Please check [3-2-stable](https://github.com/rails/rails/blob/3-2-stable/actionmailer/CHANGELOG.md) for previous changes.