Greylisting: Worthwhile?

I did a search here to see peoples' opinions on the matter, and was surprised to find that there was hardly anything.

Greylisting looks like a very effective way of rejecting spam, but the risk of delaying legitimate mail seems problematic. What I'm wondering is how well greylisting (tempfailing) has worked out in practice. Who's using it? What are your thoughts?

 

 

 

 

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