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Fedora 20 ships Perl 5.18 Postgrey has a bug that makes it fail to write it's PID file with Perl 5.18 Therefor postgrey cannot be run as a daemon from systemd on Fedora 20 and newer. A fix is in the official git repo but not in an official release yet: https://github.com/schweikert/postgrey/commit/9673b54064691a5b9c295ffea340d8a1f9ee1cb8
FYI that the patch in the official git repo but not in an official release yet works for me. Thanks.
I've just kicked off builds for postgrey-1.34-8 in Rawhide and F-20 with the patch mentioned in comment #0.
postgrey-1.34-8.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/postgrey-1.34-8.fc20
Package postgrey-1.34-8.fc20: * should fix your issue, * was pushed to the Fedora 20 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing postgrey-1.34-8.fc20' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2014-0008/postgrey-1.34-8.fc20 then log in and leave karma (feedback).
The update solves the problem for me.
postgrey-1.34-8.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.