Blame Extras/Mailman/2.1.9-4.el5/templates/en/unsubauth.txt

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Your authorization is required for a mailing list unsubscription
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request approval:
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    By:   %(username)s
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    From: %(listname)s@%(hostname)s
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At your convenience, visit:
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    %(admindb_url)s
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to process the request.