Problems:
* The implementation is directly coupled to the mail implementation and can't be mocked. Therefor it is impossible to test without access to a real mail server, no unit testing is possible. A number of test are ignored for this reason.
* Configuration is very large and cumbersome.
* Cumbersome message construction limits the ability to send informative and useful messages.
* Extension is difficult and further muddies the class.

Replace with the new templated messaging system.