Two factor authentication with app specific passwords

[drMacFaulty]

Hello,

I'd like to know whether dovecot and exim4 use MySQL as standard storage engine for users or plain files (database)? I would like to implement two factor authentication in Roundcube with the ability to generate app-specific passwords for extra security when using IMAP/SMTP on e.g. your tablet.

I found this github repository with some code for dovecot, but doesn't exim4 also need to be adjusted for this to work properly? Link: https://github.com/jusbuc2k/roundcube-a ... _passwords

If somebody could give me a hand, that'll surely be great.

P.S. Already added it as feature request in the tracker.

[drMacFaulty]

I will skip this for me, because atm it is too much of a hassle to migrate everything to sql.