[BUGFIX] #48612
powermail 2.x integration

Resolves: #48612
Releases: 6.1, 4.7, 4.5
Change-Id: I1309460fd28d28647726008f9d849ef25b62d8fe
Reviewed-on: https://review.typo3.org/29047
Reviewed-by: Ralf Zimmermann
Tested-by: Ralf Zimmermann