Consider proftpd binned, sound advice again!

Everything going to plan now, just tried apt-get install sendmail and received:

The following packages have unmet dependencies.
  sendmail: Depends: sendmail-bin (= 8.13.8-3) but it is not going to be installed
            Depends: rmail (= 8.13.8-3) but it is not going to be installed
E: Broken packages

I need sendmail bcos I'm doing a drupal site and sendmail is the default mail handler for drupal.

Any ideas why it doesn't install properly, I know it says it has unmet dependencies but I thought the whole point of Debian etch was to care of dependencies?

What should I do so I dont wreck my installation again?

Cheers,

Cliff...