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  1. vanilla 4.2BSD mail flow
  2.  
  3. LOCAL   /bin/mail ----                           -- /bin/mail -- LOCAL
  4.                       \                        / 
  5.                        ----------- sendmail --
  6.                       /          /             \
  7. LOCAL   Mail ---------          /                -- uux -------- REMOTE
  8.                                /
  9. REMOTE  /bin/rmail ------------
  10.  
  11. ==========================
  12.  
  13. smail 4.2BSD mail flow
  14.  
  15. LOCAL   /bin/mail                          -- /bin/mail -- LOCAL
  16.                  \                        /
  17.                   ------------ sendmail --
  18.                  /          /             \
  19. LOCAL   Mail ---          /                -- /bin/smail -
  20.                          /  (non-bang)                    \
  21. REMOTE  /bin/rmail ------                                  \
  22.                           \  (bang)                          \
  23.                    ------------------------------------- uux REMOTE
  24.  
  25. ==========================
  26.  
  27. vanilla SVR2 mail flow
  28.  
  29.         mail    is "/usr/src/cmd/mail.c"
  30.         rmail    is linked to mail
  31.  
  32. LOCAL    mail  ------------\              /--------------------- LOCAL
  33.                    \            /
  34. LOCAL    mailx ----> mail ---+----------+
  35.                    /            \
  36. REMOTE    rmail ------------/              \-- uux -------------- REMOTE
  37.  
  38. ==========================
  39.  
  40. Modified SVR2 mail flow using SENDMAIL
  41.  
  42. Definitions of changed/renamed programs
  43.  
  44.         mail    is "svbinmail.c"
  45.         lmail    is "/usr/src/cmd/mail.c"
  46.         rmail    is linked to smail
  47.  
  48. LOCAL    mail  ------------\                /-- lmail ---------- LOCAL
  49.                    \              /
  50.                             +--sendmail--+
  51.                    /              \
  52. LOCAL    mailx --- mail ---/                \-- smail -- uux --- REMOTE
  53.  
  54.  
  55.                                                /-- lmail ------ LOCAL
  56.                                               /
  57.                                 /--sendmail--+
  58.                                /              \
  59.                               /                \- smail - uux - REMOTE
  60.                              / (domain | LOCAL)
  61. REMOTE  rmail --------------+
  62.                              \ (bang)
  63.                               \
  64.                                \------------------ uux -------- REMOTE
  65.  
  66. ==========================
  67.  
  68. Modified SVR2 mail flow without SENDMAIL
  69.  
  70. LOCAL    mail  ------------\                /-- lmail ---------- LOCAL
  71.                    \              /
  72.                             +-- rmail ---+
  73.                    /    /         \
  74. LOCAL    mailx --- mail ---/    /           \-- uux ----------- REMOTE
  75.                               /
  76.                              /
  77. REMOTE    --------------------+
  78.  
  79. #
  80. # @(#)Flow.Diagram    2.1 smail 12/14/86
  81. #
  82.