This appendix provides a detailed explanation of the SMTP and POP3 mail protocols. It also provides information on how to isolate SMTP and POP3 mail problems, their common causes, and some steps you can take to correct them.
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 general networking concepts, refer to Appendix A: An Introduction to Networking Concepts. For more information about the TCP/IP protocol suite, refer to Appendix B: TCP/IP In Depth. For more information about the different naming services used with TCP/IP, refer to Appendix C: Name Resolution Services. For more information on the structure of SMTP mail messages, refer to Appendix E: Message Envelope, Header, Body and Parts.
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