prometheus:/etc# apt-get install ssmtp
Reading Package Lists... Done
Building Dependency Tree... Done
The following packages will be REMOVED:
  exim4 exim4-base exim4-config exim4-daemon-light
The following NEW packages will be installed:
  ssmtp
0 upgraded, 1 newly installed, 4 to remove and 75 not upgraded.
Need to get 0B/32.6kB of archives.
After unpacking 3084kB disk space will be freed.
Do you want to continue? [Y/n] y
Preconfiguring packages ...
(Reading database ... 44017 files and directories currently installed.)
Removing exim4 ...
dpkg: exim4-base: dependency problems, but removing anyway as you request:
 exim4-daemon-light depends on exim4-base (>= 4.50).
Removing exim4-base ...
Stopping MTA: exim4.
Removing exim4-config ...
dpkg: exim4-daemon-light: dependency problems, but removing anyway as you request:
 at depends on mail-transport-agent; however:
  Package mail-transport-agent is not installed.
  Package ssmtp which provides mail-transport-agent is not installed.
  Package exim4-daemon-light which provides mail-transport-agent is to be removed.
 mailx depends on exim4 | mail-transport-agent; however:
  Package exim4 is not installed.
  Package mail-transport-agent is not installed.
  Package ssmtp which provides mail-transport-agent is not installed.
  Package exim4-daemon-light which provides mail-transport-agent is to be removed.
 mutt depends on exim4 | mail-transport-agent; however:
  Package exim4 is not installed.
  Package mail-transport-agent is not installed.
  Package ssmtp which provides mail-transport-agent is not installed.
  Package exim4-daemon-light which provides mail-transport-agent is to be removed.
Removing exim4-daemon-light ...
Stopping MTA: exim4.
tar: ./templates: time stamp 2005-02-10 18:41:44 is 97262043.078899 s in the future
tar: ./control: time stamp 2005-02-10 18:41:44 is 97262043.047191 s in the future
tar: ./conffiles: time stamp 2005-02-10 18:41:45 is 97262044.046249 s in the future
tar: ./preinst: time stamp 2005-02-10 18:41:45 is 97262044.045417 s in the future
tar: ./postinst: time stamp 2005-02-10 18:41:45 is 97262044.044534 s in the future
tar: ./postrm: time stamp 2005-02-10 18:41:45 is 97262044.043699 s in the future
tar: ./config: time stamp 2005-02-10 18:41:45 is 97262044.042818 s in the future
tar: .: time stamp 2005-02-10 18:41:45 is 97262044.041901 s in the future
Selecting previously deselected package ssmtp.
(Reading database ... 43899 files and directories currently installed.)
Unpacking ssmtp (from .../archives/ssmtp_2.61-2_i386.deb) ...
Setting up ssmtp (2.61-2) ...
hostname: Unknown host
dpkg: error processing ssmtp (--configure):
 subprocess post-installation script returned error exit status 1
Errors were encountered while processing:
 ssmtp
E: Sub-process /usr/bin/dpkg returned an error code (1)