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Where can I get more technical info on the Simple Mail Transfer Protocol (SMTP)?

April 26, 2017info mail Protocol simple SMTP Technical transfer

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Where can I get more technical info on the Simple Mail Transfer Protocol (SMTP)?

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You may read the original Request For Comments (RFC 821) by Jonathan B. Postel, August 1982 and the improved version (RFC 2821) by The Internet Society, April 2001. The latter also makes RFC 974 and RFC 1869 obsolete.