Content-Length:
The size of the body of the message System V Release 4
The Content-Length:
header describes the exact size of the body of a
message. The size is always a decimal expression of
the number of bytes occupied by the body:
Content-Length: 5678
It is used by some MUAs to find the end of the message in a large file of many messages. It is always created or added by MUAs or delivery agents and never by MTAs. It should never be declared in the configuration file.
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