[FEATURE] #4283 Delegate to SwiftMailer.

Change-Id: I863cfaaa6a1c2d743957fc99ceb77539435a55cb
Reviewed-on: http://review.typo3.org/32484
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>