Pylons/pyramid_mailer — pull request #48 by moriyoshi (2013-08-19 14:24:02+00:00)
Title: Do not supply charset parameter to set_payload.

Specifying the charset to email.message.Message eventually instructs it to dismiss the charset specified in Content-Type and furthermore recode the payload charset according to the global mappings predefined in the module, which is totally unwanted.