MINOR: New email object for each recipient
MINOR: New email object for each recipient

Creating a new email object for each recipient so that no state from the previous email object is carried through. Fixes silverstripe/silverstripe-userforms#356.
dnadesign/silverstripe-userforms,candidasa/silverstripe-userforms,dnadesign/silverstripe-userforms,candidasa/silverstripe-userforms,robbyahn/silverstripe-userforms,candidasa/silverstripe-userforms,silverstripe/silverstripe-userforms,robbyahn/silverstripe-userforms,silverstripe/silverstripe-userforms