RFC 2821:Simple Mail Transfer Protocol
RFC-Ref

7 - 8 - A - B - C - D - E - F - G - H - I - L - M - N - O - P - Q - R - S - T - U - V - W - X

STD 1

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7 - 8 - A - B - C - D - E - F - G - H - I - L - M - N - O - P - Q - R - S - T - U - V - W - X

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