RFC 784 July 1981
Mail Transfer Protocol
+-----+ +-----+ +------+ +------+
| MTP | | MTP | | USER | |OTHER |
| TCP | | NCP | | MAIL | |MAIL |
| RCV | | RCV | | PGM | |SOURCE|
+-----+ +-----+ +------+ +------+
| | | |
| | | |
| | | |
v v v v
+----+ +----+ +----+ +----+
| | | | | | | |
Pending +----+ | +----+ | +----+ | +----+ | Files | |-+ | |-+ | |-+ | |-+
| | | | | | | |
+----+ +----+ +----+ +----+
\ | | /
\ | | /
\ | | /
v v v v
+------------------+ TABLES
| | +----+
| DISPATCHER |<----->| |---+
| | | | |
+------------------+ +----+ |
/ / \ \ +----+
/ / \ \
/ / \ \
v v v v
+-----+ +-----+ +-------+ +-----+
| MTP | | MTP | | LOCAL | |OTHER|
| TCP | | NCP | |MAILBOX| |MAIL |
| SND | | SND | | FILES | |SINK |
+-----+ +-----+ +-------+ +-----+
Note that current implementation the dispatcher and the senders for MTP-on-TCP and MTP-on-TCP are combined in one program.
Sluizer & Postel Page [3]
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