Your search for "greylisting" returned 2 results:
Allow Storing ORF Databases in the Cloud (e.g. Azure, Amazon)
Add support for storing the databases of ORF (as of writing this, these are the Auto Sender Whitelist and the Greylisting databases) in the cloud, using e.g. Microsoft® Azure or Amazon SimpleDB™. This would allow low-cost sharing the databases without switching to Microsoft® SQL Server (or its free Express edition).
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DONE Do Not Greylist Email on SPF Pass
Add option to skip the Greylisting test if the sender passes the SPF test (SPF Pass result).