RFC 1651:SMTP Service Extensions
RFC-Ref

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

standardization state and status

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

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