Here is the context:
"Please enter a colleagues email address: "Please enter a colleagues email address:
My coworker believes that in this context, it should be colleaguescolleagues. I think that because it is a possessive noun, that it should be colleague'scolleague's. I am no English expert, but I did learn about the use of apostrophes in public school... what do you guys thinkwhich version is correct?