Which mailx package should I install for Nagios?
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        Published on 2011-03-05T21:50:18Z
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I'm following the Nagios Ubuntu quickstart instructions. I'm on Ubuntu 10.10 and installing Nagios 3.2.3.
At the bottom of the docs it says I need to install the mailx and postfix packages. (Postfix is already installed.) But when I try to install mailx, I get asked which of 3 packages to install:
$ sudo apt-get install mailx
[sudo] password for nagios: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package mailx is a virtual package provided by:
  mailutils 1:2.1+dfsg1-4ubuntu1
  heirloom-mailx 12.4-1.1
  bsd-mailx 8.1.2-0.20090911cvs-2ubuntu1
You should explicitly select one to install.
E: Package mailx has no installation candidate
Which one should I install?
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