remove comment
simplify simple receiver
remove simple sender, and unnecessary sender interface
simplify postmark sender
Merge branch 'master' into sender
don't validate sender options
don't use postmark-specific methods
add sugar to sender base
subclass Mail::Message
rename variable
add mandrill message class
redo mandrill integration, using new classes
use JSON.load consistently
remove dependency on mandrill gem
restart encrypted env vars
fix return_response for postmark
update docs for return_response
add vcr, update comments
add a message class for sendgrid