The word newsletters is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 16
Highest Scoring Words With Friends™ Play In The Letters newsletters
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Seven Letter Word Alert: (34 words)
entrees, letters, nesters, nestles, netless, netters, nettles, relents, renests, resents, retests, retweet, settees, setters, settler, settles, streets, sweeten, sweeter, swelter, teeters, telnets, tensest, tenters, tersest, testers, treelet, trestle, tweeter, western, wetness, wetters, wrenlet, wrestle