mail exchanger

from The Free On-line Dictionary of Computing (8 July 2008)

mail exchanger

   <messaging> A {server} running {SMTP} {Message Transfer Agent}
   {software} that accepts incoming {electronic mail} and either
   delivers it locally or forwards it to another server.  The
   mail exchanger to use for a given domain can be discovered by
   querying {DNS} for {Mail Exchange Records}.

   (2007-01-29)