Aha! I'm sorry. I misinterpreted your reply. You mean I have to
create an application-specific password to use IMAP once I've enabled
2-factor authentication. (I don't know where I got "authentification"
from ... fingers on auto-pilot, I guess.)
I've done this. I created an application password just for mutt that allows
mutt to bypass Google's two-step verification.
I encrypted it with openssl with my normal email password, so now mutt asks me
for the aes-256 password at startup and it's the same effectively as typing in
my email password once per session.
To encrypt the password I entered this on the commandline (OS X):
openssl aes-256-cbc -salt -out pw.txt -in cleartext.txt
(openssl then prompts your for an encryption password)
and in my muttrc file I wrote:
set imap_pass = `openssl aes-256-cbc -salt -d -in ~/.mutt/pw.txt`
set smtp_pass = $imap_pass
