when I create copies from mailing and change content and target groups, everything works fine. But when I make a modification to the original, it overrides the changed target groups in copies. We use date date based mailings and suddenly they started ending at the wrong addresses. I also noticed that when I make a copy of a mailing, it automatically means that the copy has a template (the original) and it can't be changed. Is it an intended behaviour or is it a bug (it looks like one). If it's intended, how to make copies without the dependency? We use 2015 R3 version.
Thank you very much, Petr.