This appendix provides a detailed explanation of the different components found in electronic mail messages, including the envelope, headers, body and parts of the messages.
This appendix should be read by anyone responsible for the successful operation of an SMTP or POP3 mail system, or anyone connecting their organization to the global Internet.
For more information on the SMTP and POP3 mail protocols, refer to Appendix D: SMTP and POP3 Mail.
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