notmuch: handle new mailing lists

[~bandali/configs] / getmail / .getmail / getmailrc

[retriever]
type = SimplePOP3SSLRetriever
server = fencepost.gnu.org
username = aminb
port = 995
use_apop = True

[destination]
type = Maildir
path = ~/mail/gnu/Inbox/

[options]
delete = True