Rated 2 out of 5 stars

It does not work for me under these conditions:
- I have three mail accounts
- all mails from these accounts become collected in my standard account xy@posteo.de (which has two sub identities)
- in the settings of "Correct Identity" for this standard account I choose, that new messages shall become send not from the standard, but from another account xy@abc.de
- under these conditions "Correct Identity" seems not to work correctly, when I reply to my mails, which had been sent to the xy@posteo.de account.

When I choose in the settings that new messages shall become send from my standard identity, then it works fine. But this is not what I want.
Is this normal or is there any mistake? I hope I describe my problem more or less clearly.