Not sure if I should file this as a Fedora bug, but the port of the DBMail src.rpm from 3.0.0-rc1 to 3.0.0-rc2 did not change patch #2 (for RHEL/EPEL) and does not apply anymore to the rc2 sources. Attached is the correct version of patch #2 (dbmail-3.0.0-glib.patch) for rc2. FWIW, I also filed a bug in EPEL (#730381) to upgrade DBMail to the newest version.
Created attachment 518075 [details] RC2-compatible replacement for dbmail-3.0.0-glib.patch (patch #2)
dbmail-3.0.0-0.6.rc3.el6 has been submitted as an update for Fedora EPEL 6. https://admin.fedoraproject.org/updates/dbmail-3.0.0-0.6.rc3.el6
Package dbmail-3.0.0-0.6.rc3.el6: * should fix your issue, * was pushed to the Fedora EPEL 6 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=epel-testing dbmail-3.0.0-0.6.rc3.el6' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/dbmail-3.0.0-0.6.rc3.el6 then log in and leave karma (feedback).
dbmail-3.0.0-0.6.rc3.el6 has been pushed to the Fedora EPEL 6 stable repository. If problems still persist, please make note of it in this bug report.