Problemas para instalar qmail

["capitan_buscapina" <capitan_buscapina@fibertel.com.ar>]

Tengo que instalar qmail y segui los pasos que hay en la pagina de bulma,
para instalarlo me pide que desintale sendmail pero me tira este error y no
me deja instalar qmail

~# dpkg --purge sendmail
(Reading database ... 29611 files and directories currently installed.)
Removing sendmail ...
Stopping Mail Transport Agent: sendmail.
Cleaning up the queues...find: /var/spool/mqueue: No such file or directory
done.
rmdir: `/var/spool/mqueue': No such file or directory
dpkg: error processing sendmail (--purge):
 subprocess pre-removal script returned error exit status 1
Errors were encountered while processing:
sendmail

Alguna otra forma de desintalarlo?
Gracias