Gentoo 'mail' user/group has uid/gid 8/12 respectively. This makes
postfix' 'virtual' complain about 'bad uid'. Then the default is set
back to 'vmail' user/group. You can force using the 'mail' user (which
is responsible for the local mail delivery files) by adding to
/etc/postfix/main.cf the following lines:
virtual_minimum_uid = 8
virtual_minimum_gid = 12
But this is not encouraged, so the default is to create a really
unprivileged 'vmail' user with a high uid/gid (above 1000).
Due to this, the test for already existent uid/gid is added here (if
you have set uid/gid on froxlor but they don't actually exist, lines to
add the user/group will be added to the config file as it does with the
other distro's files.
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