From Longman Dictionary of Contemporary Englishcopy somebody in phrasal verbto send someone a copy of an email message you are sending to someone else on Can you copy me in on the memo you’re sending to Chris? → copy→ See Verb table
Examples from the Corpus
copy in• If possible, duplicate and distribute copies well in advance of the tutorial.• If you make a copy of a file, the copy is identical in every way, except in name.• The page featured a photo of Joe looking over a piece of copy, cigarette in hand.• I put one copy of each in my scrapbook and sent one to my parents on Okinawa.• The beginner would be well advised to copy them out in open score with the necessary transpositions.• It was probably true that Herkomer had at least copied from photographs in the execution of some of his portrait commissions.• The first drugs attacked the copying enzyme in the hope that if the virus could not translate its information it would fail.• From the copy now in the possession of Mr. Tony Titford of West Horsley. 