Already rejected, config dialog multiaccount

> Before going on and polish the code I would like to hear if the
> direction is the right one.

Hi Francesco,
thanks for taking the time to write this. I agree with the other people
on the list (you might want to subscribe to receive these replies, in
the meanwhile, see [1]) -- having a combobox for account selection is
not something that I particularly like. Could you please make it similar
in appearance to the way how the sender identities are configured?