Ok, Found it also...
Just in case anybody wonders where that is:
Email app -> Settings -> General Settings -> Default image size -> set to desired setting (Original/70%/30%/10%/Always Ask)
Have a Great Day.
Well, I can't seem to find this setting (composing and sending) ... :o( and it's driving me nuts...
Can anyone guide me?
(Samsung Galaxy Tab3, Android 4.2.2)
Thx.