[Bug 674483] Re: package postfix 2.7.0-1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 75

[Chuck Short]

You have an invalid hostname:

Running newaliases

newaliases: warning: valid_hostname: numeric hostname: 04

newaliases: fatal: file /etc/postfix/main.cf: parameter mydomain: bad
parameter value: 04

dpkg: error processing postfix (--configure):

 subprocess installed post-installation script returned error exit
status 75

Setting up procmail (3.22-18ubuntu1) ...

** Changed in: postfix (Ubuntu)
       Status: New => Invalid

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package postfix 2.7.0-1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 75
https://bugs.launchpad.net/bugs/674483
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