[Users] sent account not corrosponding to current mailbox

[exsudat]

I have three accounts and three mailbox.

If I am reading mails in mailbox2 and reply or create a new message
there is also the account from mailbox1 used in the from-field.

How can I change this unexpected behaviour.

If I am in maiblox at xxx.org and press "Create message" of course I want
to write with this adress in the from field.
Why does Claws think here the other way?