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The Network Independent Transport Service [6] may be used.

Connection Establishment

The SMTP transmission channel is established via NITS between
the sender process and receiver process. The sender process
executes the CONNECT primitive, and the waiting receiver
process executes the ACCEPT primitive.

Data Transfer

The NITS connection supports the transmission of 8-bit bytes.
The SMTP data is 7-bit ASCII characters. Each character is
transmitted as an 8-bit byte with the high-order bit cleared to

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