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# __construct()
 -  throws an InvalidArgumentException exception if the strategy is not valid
 -  passes the parameters to the main transport
 -  passes the parameters to the main transport
 -  throws an InvalidArgumentException exception if the spool_class option is not set with the spool delivery strategy
 -  recognizes the spool delivery strategy
 -  recognizes the spool delivery strategy
 -  throws an InvalidArgumentException exception if the delivery_address option is not set with the spool single_address strategy
 -  recognizes the single_address delivery strategy
 -  disables logging if the logging option is set to false
 -  enables logging if the logging option is set to true
# ->compose()
 -  returns a Swift_Message instance
 -  takes the from address as its first argument
 -  takes the to address as its second argument
 -  takes the subject as its third argument
 -  takes the body as its fourth argument
# ->composeAndSend()
 -  composes and sends the message
 -  takes the from address as its first argument
 -  takes the to address as its second argument
 -  takes the subject as its third argument
 -  takes the body as its fourth argument
# ->flushQueue()
 -  throws a LogicException exception if the delivery_strategy is not spool
 -  sends messages in the spool
 -  sends messages in the spool
 -  sends messages in the spool
 -  sends messages in the spool
# ->sendNextImmediately()
 -  implements a fluid interface
 -  bypasses the spool
 -  bypasses the spool
 -  bypasses the spool but only for the very next message
 -  bypasses the spool but only for the very next message
# ->getDeliveryAddress() ->setDeliveryAddress()
 -  sets the delivery address for the single_address strategy
# ->getLogger() ->setLogger()
 -  sets the mailer logger
# ->getDeliveryStrategy()
 -  returns the delivery strategy
# ->getRealtimeTransport() ->setRealtimeTransport()
 -  sets the mailer transport
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