I did a small HOWTO of how to disable all at the same time. This HOWTO is for Linux/Ensim.
HOWTO Begins:
Note: All command must be Logged as root;
1. First of all we have to disable the email alias in all sites.
CODE
ls /home/virtual/ | grep site | while read x; do echo $x; grep -v "majordomo" /home/virtual/$x/fst/etc/aliases > aliases.tmp; mv -f aliases.tmp /home/virtual/$x/fst/etc/aliases; chroot /home/virtual/$x/fst/ newaliases; done;
2. Now we remove user majordomo from site /etc/passwd.
CODE
ls /home/virtual/ | grep site | while read x; do echo $x; grep -v "majordomo" /home/virtual/$x/fst/etc/passwd > passwd.tmp; mv -f passwd.tmp /home/virtual/$x/fst/etc/passwd; done;
3. And now we remove majordomo from site /etc/group
CODE
ls /home/virtual/ | grep site | while read x; do echo $x; grep -v "majordomo" /home/virtual/$x/fst/etc/group > group.tmp; mv -f group.tmp /home/virtual/$x/fst/etc/group; done;
4. Last restart sendmail, I don't know if this is really necessary, but lets do it anyway.
CODE
service sendmail restart
Thanks, for reading. Feel free to comment/suggest.