Just wanted to answer an older email stored in a local folder.
It is not possible to automatically add a signature when doing so.
You can choose to add a signature in the settings and where and how,
but you can't enter one like in the settings for real mailbox or choose
from which mailbox settings a signature may be chosen from.
Thus, answering an email won't insert any address data or such to your email.
(Workaround: copied the mail to another real smailbox, clicked "reply" there.)
