Create an address book group from a list of emails

Hi everyone,

I'm not sure what the etiquette for first posts is around here, but please indulge me a question on my first go

I have roughly 9000 cards in my address book. I have a list of 400 email addresses, and I'd like to create a (smart?) group containing any existing cards that correspond to these email addresses - any pointers?

Hopefully the above is clear - I thought it'd be a cinch, but it's surprisingly problematic

Thanks in advance!