legally acceptable as mail, as in terms of content, size, or weight.

1835–45, Americanism; mail1 + -able

mailability, noun
unmailable, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mail1 (meɪl)
1.  Also called (esp Brit): post letters, packages, etc, that are transported and delivered by the post office
2.  the postal system
3.  a single collection or delivery of mail
4.  a train, ship, or aircraft that carries mail
5.  short for electronic mail
6.  (modifier) of, involving, or used to convey mail: a mail train
7.  chiefly (US), (Canadian) Usual Brit word: post to send by mail
8.  to contact (a person) by electronic mail
9.  to send (a message, document, etc) by electronic mail
[C13: from Old French male bag, probably from Old High German malha wallet]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Any item smaller than the minimum dimensions is not mailable.
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