The word mailsorter 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: 14
Highest Scoring Words With Friends™ Play In The Letters mailsorter
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Seven Letter Word Alert: (48 words)
armlets, armoire, armrest, artsier, atomise, estriol, isolate, loamier, loiters, lorries, maestro, mailers, maltier, maltose, marlite, marries, mistral, moister, morales, mortals, mortars, mortise, motlier, realism, realist, realtor, remails, reroast, retails, retrial, retrims, rioters, roamers, roaster, roister, rostral, saltier, slatier, smarter, smartie, stromal, tailors, tarries, toilers, trailer, tramels, tremors, trimers