filtering with sed

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MDonHarropdon@nis4u.com
Msinck@ugive.comsinckugive.com
Msinck@ugive.com
MKevin Buettner
MKevinBuettnerkev@primenet.com
Mplug@arcticmail.complugarcticmail.com
Mplug@arcticmail.com
MJon Revie
MJonRevierevie@home.com