This is not a package bug, but a local configuration issue.  From the
provided dpkg 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

All numeric host names aren't valid.  If you set a valid hostname on the
system, postfix will configure correctly.

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

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https://bugs.launchpad.net/bugs/1635759

Title:
  package postfix 3.1.0-3 failed to install/upgrade: subprocess
  installed post-installation script returned error exit status 75

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