[pohst-mas-ter, -mah-ster]
the official in charge of a post office.
(formerly) the master of a station that furnished post horses to travelers.

1505–15; post3 + master

postmastership, noun
subpostmaster, noun
subpostmastership, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
postmaster (ˈpəʊstˌmɑːstə)
1.  Also (feminine): postmistress an official in charge of a local post office
2.  the person responsible for managing the electronic mail at a site

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Computing Dictionary

postmaster definition

The electronic mail contact and maintenance person at a site connected to the Internet or UUCPNET. Often, but not always, the same as the admin. The Internet standard for electronic mail (RFC 822) requires each machine to have a "postmaster" address; usually it is aliased to this person. See also webmaster.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
The postmaster came out to see what in the world was causing all the commotion.
Appeals to the mayor, the police commissioner and the postmaster general have had no effect, the newspaper says.
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