#a
#b  Remap local names (and recognize them) to their "canonic" forms.
#c  thus having multiple machines on the same mailer..
#d
#e  WARNING:  MUST BE IN  sort(1)  ORDER!   (For binary search)
#f
#g Left side:  local name to be recognized
#h Right side: local name to be presented out
#i
#j1 Example:   ftp.debian.org ftp.debian.org
#j2            www.debian.org www.debian.org
#k
#l  Both are local, but presented differently
