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I am attempting to follow the Civimail install tutorial on my ubuntu Edgy box.  I installed the long list of packages shown: 

Installation: Debian/Ubuntu Systems

   1. Make sure you have the following packages installed: debconf | debconf-2.0, adduser (>= 3.34), file, libmime-perl (>= 5.417), libmime-perl (<< 5.419) | libmime-perl (>= 5.420), libconvert-tnef-perl (>= 0.06), libconvert-uulib-perl (>= 1.0.5), libcompress-zlib-perl (>= 1.35), libarchive-tar-perl, libarchive-zip-perl (>= 1.14), libmailtools-perl (>= 1.58), libunix-syslog-perl, libnet-perl (>= 1:1.16) | perl-modules (>= 5.8.1), libnet-server-perl, libtime-hires-perl, libdigest-md5-perl, libmime-base64-perl, libio-stringy-perl, libberkeleydb-perl, exim4 | mail-transport-agent, perl (>= 5.6.0-16), libsoap-lite-perl, libmail-verp-perl.
          * For Debian 3.1 (sarge) you might need to get yourself a newer libcompress-zlib-perl, as sarge ships 1.34-1.
          * For Ubuntu 6.06 (Dapper) you might need to either downgrade or upgrade libmime-perl, as Dapper ships the broken 5.419-1 version.
   2. Download our pre-built amavisd-new_2.4.2-4civimail3_all.deb and install it with `dpkg -i amavisd-new_2.4.2-4civimail3_all.deb`.

The package "mail-transport-agent" does not exist in the repositories so I went with exim4.  I installed the amavisd package and that went fine.  But then installing postfix gives the error quoted below.  Basically exim4 and postfix are alternatives and you can't install both on the same system.  Installing exim4 will force the removal of postfix, and vice versa.  What am I doing wrong?

dan@ghyfc:~$ sudo aptitude -s install postfix
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading extended state information
Initializing package states... Done
Building tag database... Done
The following packages are BROKEN:
  exim4 exim4-config
The following packages will be automatically REMOVED:
  exim4-daemon-light
The following NEW packages will be installed:
  postfix
The following packages will be REMOVED:
  exim4-daemon-light
0 packages upgraded, 1 newly installed, 1 to remove and 0 not upgraded.
Need to get 0B/1067kB of archives. After unpacking 1626kB will be used.
The following packages have unmet dependencies:
  exim4-config: Conflicts: postfix but 2.3.3-1 is to be installed.
  exim4: Depends: exim4-daemon-light but it is not installable or
                  exim4-daemon-heavy but it is not installable or
                  exim4-daemon-custom which is a virtual package.
Resolving dependencies...
The following actions will resolve these dependencies:

Remove the following packages:
exim4
exim4-base
exim4-config

Score is -279

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