Thank you for your report.
This looks like a local configuration problem, rather than a bug in
Ubuntu.
You can find pointers to get help for this sort of problem here:
http://www.ubuntu.com/support/community
Since we use this bug tracker to track bugs in Ubuntu, rather than
configuration
>From log:
newaliases: warning: valid_hostname: numeric hostname: 04
newaliases: fatal: file /etc/postfix/main.cf: parameter mydomain: bad parameter
value: 04
dpkg: error processing package postfix (--configure):
subprocess installed post-installation script returned error exit status 75
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** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1626337
Title:
package postfix 3.1.0-3 failed to install/upgrade: subprocess
installed post-installation script