Manage bulk custom attribute mail recipients

Exch10 used Ask the Experts™

I would like to put a custom attribute to list of mail user (on exchange 2007) i have on a csv file.
The csv file is come from a linux application. It gives me the following informations for 120 users:
DN, givenname (=firstname), sn (=lastname), uid (= alias), mail

What powershell command should I pass?
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Do you have column names in csv? Do you like to add same custom attribute?
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