Newish domains scoring

I know this is a question for the SA users group but I wanted to throw 
it in here in the even anyone has any ideas or existing solutions.

So, here we go.

We almost never get any phishing email from domains over 1 year old.

We get a lot of phishing email from domains less than 1 year old.

I would love to be able to have an accurate way of scoring up email from 
domains less than fill in the blank days old.  In my case 380 days.  
This way we could review them for validity and release them if they are 
good.

An accurate way of performing this check would save us quite a bit of 
grief.

Ideas or solutions to this anyone?



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