    class
    	MAILER

    General
    	cluster: mail
    	description: "Mailer object used to send or retrieve resources"
    	create: default_create

    Ancestors
    	ANY

    Queries
    	error: BOOLEAN
    	from_resource: EMAIL_RESOURCE
    	to_resource: EMAIL_RESOURCE
    	transfer_error: TRANSFER_ERROR

    Commands
    	set_from_resource (resource: EMAIL_RESOURCE)
    	set_to_resource (resource: EMAIL_RESOURCE)
    	transfer