How do I completely remove a package?

Hi. I need to completely remove postfix. I tried:

apt-get remove
apt-get purge
apt-get --purge remove

but I can still see it in dpkg --get-selections and I can start postfix from /etc/init.d/

So how do I remove it completely ?
tnx

 

Did you removed postfix using sudo apt-get autoremove postfix --purge?

 

re

I did but it tried to replace postfix with exim and gives me this error:

So in the end postfix is still not removed.

 

Not really a response, but a question: why do you want to remove Postfix in the first place?