ENH: Provide various levels of logging in the code

[metaperl]

Is your feature request related to a problem? Please describe.
When I encountered #63 I first sought to enable debug-level logging to see what the problem was. But upon inspecting the red-mail code, it became clear that there is no logging of any sort - info, debug, etc. This makes it harder to trace problems with code.

Describe the solution you'd like
Provide various levels of logging in the code.