** Description changed:

  Binary package hint: mdadm
  
  Anybody who cares about redundancy to use mdadm probably cares enough
  about redundancy to want being informed if redundancy is degraded.
  
  Debian systems do have at least local mail enabled and package mdadm
  asks for a mail address to notify during mdadm install.
  
  By default ubuntu system support no local mail and mdadm package was
  patched to suppress the debconf email question, without setting up mdadm
  --monitor to use wall or notify-send as an alternative.
  
  As informing a human is a serious data protection topic mdadm should
  depend on a package providing at least local mail services and/or use
  wall/notify-send to get the message out.
+ 
+ ---
+ 
+ The monitoring facility of mdadm is very important to get notice if
+ somthing goes wrong with your raid.
+ 
+ So you can replace disks etc. ahead of a total failure.
+ 
+ To send out notifications mdadm needs a sendmail command (MTA mail
+ transport agent ).
+ 
+ To deliver mail localy you need a mail delivery agent (MDA)
+ 
+ Things like exim, postfix open network ports and are large and not easy
+ to configure, but of course provide the sendmail command and delivery.
+ 
+ If none of the large MTAs is installed, yes mdadm should pull in a
+ replacement like esmtp + procmail but no postfix on desktops.

-- 
mdadm monitor feature broken, not depending on local MTA/MDA or using 
wall/notify-send
https://bugs.launchpad.net/bugs/535417
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