English Dictionary
postmaster
n : the person in charge of a post office
English Computing Dictionary
postmaster
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}.