Connected: An Internet Encyclopedia
RFC 1123 - 5.2.9 Command Syntax: RFC-821 Section 4.1.2
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5.2.9 Command Syntax: RFC-821 Section 4.1.2

The syntax shown in RFC-821 for the MAIL FROM: command omits the case of an empty path: "MAIL FROM: <>" (see RFC-821 Page 15). An empty reverse path MUST be supported.


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Connected: An Internet Encyclopedia
RFC 1123 - 5.2.9 Command Syntax: RFC-821 Section 4.1.2