Ah, sorry I over-read you updated.

** Description changed:

  Binary package hint: mdadm
  
  When upgrading to Jaunty from Intrepid, the mdadm package installed
  postfix. I can't see why a package that manage software RAID partitions
  needs a mail transport agent, but what is worse is that my desktop
  machine is suddenly turned into a mail server. One of the reasons Ubuntu
  desktop is deemed secure is that it does not run unnecessary services.
  
  The dependency has been introduced in version 2.6.7.1-1ubuntu5; from the
  changelog:
  
  mdadm (2.6.7.1-1ubuntu5) jaunty; urgency=low
  
-   * Depend on postfix | mail-transport-agent, to ensure we get the
-     correct default MTA for Ubuntu.
+   * Depend on postfix | mail-transport-agent, to ensure we get the
+     correct default MTA for Ubuntu.
  
- During the upgrade the postfix configuration was run and although I ticked 
not to configure, the postfix service was running by default anyway.
-  
- I manually uninstalled postfix and mdadm runs perfectly fine. Can this 
dependency be removed?
+ During the upgrade the postfix configuration was run and although I
+ ticked not to configure, the postfix service was running by default
+ anyway.
+ 
+ I manually uninstalled postfix and mdadm runs perfectly fine. Can this
+ dependency be removed?
+ 
+ --
+ 
+ -> mdadm should by default only install with a small local mail delivery
+ system (like esmtp + procmail) but not postfix on desktops, laptops
+ etc.! On servers postfix is pulled in by server tasks anyway.
+ 
+ Here is how to setup esmtp+procmail:
+ apt-get install esmtp procmail
+ echo mda=\'/usr/bin/formail -a \"Date: \`date -R\`\" \| /usr/bin/procmail -d 
%T\' >> /etc/esmtprc
+ (as documented in /usr/share/doc/esmtp/README)

-- 
mdadm installs postfix
https://bugs.launchpad.net/bugs/379882
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