[CentOS] Postgrey on CentOS 6

Hi,

I administer a postfix mail server on CentOS 6.
Now I want to setup another with similar configuration.

But the postgrey package is no longer available in Epel
for this CentOS release as I have seen now:
https://admin.fedoraproject.org/pkgdb/package/rpms/postgrey/

1. Will I have to make an upgrade of the existing mail server
   to get security patches again or is it not critical to
   use the old package?

2. Can you give advice for an alternative setup 
   of greylisting for postfix on CentOS 6?

Cheers,

	Gabriele
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