Update the "SES" and "sendmail" mailers for the new API; remove "encoding"
- Sent mail with SES.
- Sent mail with "sendmail". I don't have sendmail actually configured to an upstream MTA so I'm not 100% sure this worked, but the sendmail binary didn't complain and almost all of the code is shared with SES, so I'm reasonably confident this actually works.
Reviewed By: amckinley
Differential Revision: https://secure.phabricator.com/D19965