RFC: SMTP/POP3/IMAP

SMTP RFC https://www.ietf.org/rfc/rfc5321.txt

POP3 RFC https://www.ietf.org/rfc/rfc1939.txt

IMAP RFC https://www.ietf.org/rfc/rfc3501.txt


(IETF Documents && IETF Datatracker)

 AMP: Accelerated Mobile Pages RFC: DNS 

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