Remove Sendmail from Ubuntu

This should help you completely uninstall Sendmail and all that comes with it.

First, stop the service (assuming it's running).

sudo /etc/init.d/sendmail stop

Uninstall sendmail and sendmail-bin

sudo apt-get remove sendmail sendmail-bin

After running that, the output said procmail was installed with Sendmail and can be uninstalled. So, I ran this command to remove procmail.

sudo apt-get remove procmail

After removing procmail, the output said sendmail-base m4 sendmail-cf and libdb4.8 were installed with procmail and can be uninstalled. So, I ran this command to remove them.

sudo apt-get remove sendmail-base m4 sendmail-cf libdb4.8

Even after all that, we still have some files on our server we didn't want. So we have to perform a purge.

sudo apt-get purge sendmail sendmail-bin

Finally, a reboot is required.

sudo reboot

After the reboot, your box should be completely rid of sendmail.