[FEATURE] first powermail2 tests
Related: #48612
Releases: 6.1, 6.0, 4.7, 4.5

Change-Id: I0e918f4116e4cd837e58148e450b2cd7932b02a0
Reviewed-on: https://review.typo3.org/25529
Reviewed-by: Ralf Zimmermann
Tested-by: Ralf Zimmermann