apt-get remove exim .... wants to remove more?

[Andy <list@firman.us>]

I want to install qmail to give it a test drive and thought it might be a good 
thing to remove exim.  But look at all that will be removed below....
Why does Debian want to remove all those other packages?

steelhead:~# apt-get remove exim
Reading Package Lists... Done
Building Dependency Tree... Done
The following packages will be REMOVED:
  anacron apache at exim leafnode logrotate mailagent mailx mutt qpopper samba 
swat
0 packages upgraded, 0 newly installed, 12 to remove and 0  not upgraded.
Need to get 0B of archives. After unpacking 15.9MB will be freed.
Do you want to continue? [Y/n] n
Abort.
steelhead:~#