A few weeks ago there was an update to the underlying Greylisting app, postgrey, from EPEL and unfortunately this irretrievably stomped on your Greylisting settings. There is an update coming to app-greylisting tonight which fixes the config file that the EPEL update stomped on, but there is no way of recovering your settings (the Delay and Retention Time), so you need to check yours in the webconfig and set them as you want. You can do this now before the app update, but postgrey may not follow the delay you set and use 60s instead until the update is received.

I have raised the issue on the EPEL mailing list suggesting they use different flags for the config file when doing an update so settings don't get stomped on.