Hi Jordi, If I'm not mistaken, Debian installs maidag without setuid bit, thus no fix is needed.
If installed setuid, make sure it is executable only for the user MTA is running as, e.g. $ ls -l /usr/sbin/maidag -rwsr-xr-- 1 root daemon 67456 Dec 25 2016 /usr/sbin/maidag Regards, Sergey
