exim4-base 4.60-3ubuntu3.3 (amd64 binary) in ubuntu dapper

 Exim (v4) is a mail transport agent. exim4-base provides the support
 files needed by all exim4 daemon packages. You need an additional package
 containing the main executable. The available packages are:
 .
  exim4-daemon-light
  exim4-daemon-heavy
 .
 If you build exim4 from the source package locally, you can also
 build an exim4-daemon-custom package tailored to your own feature set.
 .
 Information about the way Debian has built the binary packages is
 obtainable in /usr/share/doc/exim4-base/README.Debian.gz, and the
 very extensive upstream documentation is shipped in
 /usr/share/doc/exim4-base/spec.txt.gz. To repeat the
 debconf-driven configuration process in a standard setup,
 invoke dpkg-reconfigure exim4-config. There is a Debian-centered
 mailing list, pkg-exim4-users@lists.alioth.debian.org. Please ask
 Debian-specific questions there, and only write to the upstream
 exim-users mailing list if you are sure that your question is not
 Debian-specific. You can find the subscription web page on
 http://lists.alioth.debian.org/mailman/listinfo/pkg-exim4-users
 .
 exim is a drop-in replacement for sendmail/mailq/rsmtp.
 .
 Upstream URL: http://www.exim.org/