According to the example given in manifests/mta.pp,
$mydestination should allow '$myorigin, myapp.example.com'.
However, the regular expression didn't allow this value.

Test with puppet parser validate and puppet-lint.
http://docs.puppetlabs.com/guides/style_guide.html

find . -type f -exec perl -pi -e 's/postfix-ng/postfix/' {} \;