You can find protocol information and information about journal
entries, and more.
Protocol information
Simple Mail Transfer Protocol (SMTP)
Post Office Protocol (POP)
Mail server journal entries
This topic provides information for understanding journal entries. Use the following tables to understand the codes and messages used in journal entries.
Simple Mail Transfer Protocol
Simple Mail Transfer Protocol (SMTP) is a TCP/IP protocol used in sending and receiving e-mail. It is typically used with POP3 or Internet Message Access Protocol to save messages in a server mailbox and download them periodically from the server for the user.
Post Office Protocol
The Post Office Protocol (POP) Version 3 mail interface is defined in Request for Comments (RFC) 1725. RFC is the mechanism used to define evolving Internet standards.