Mandrill is simple, powerful transactional email from the same people that brought you Mailchimp.
You can find more information here.
List all tags.
List all subaccounts.
Pings Mandrill (not really a trigger, but used for testing).
Triggers when a new template is added.
Catch and trigger off of any webhook that Mandrill sends.
Send an email via a template.
Send an email through Mandrill's system!