Is it possible to create a sieve rule to sort existing emails?

Question

I have made a (very) simple sieve script to sort incoming emails, but I was wondering if it is possible to sort existing emails into folders using sieve? I'm very new to sieve and I couldn't find resources online on whether this was possible or not.

require ["fileinto"];

if address :is "from" ["email1@email.com", "email2@email.com", "email3@email.com", "email4@email.com"]
{
    fileinto "Family";
}

Many thanks.