Simple Mail Transfer Protocol (SMTP) - NETWORK ENCYCLOPEDIA

What is SMTP (Simple Mail Transfer Protocol)? | Definition from TechTarget

How to Choose the Right SMTP Port (Port 25, 587, 465, or 2525)

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SOLVED: SMTP (Simple Mail Transfer Protocol) is the standard protocol for transferring mail between hosts over TCP. A TCP connection is set up between a user agent and a server program. The server listens on TCP port 25 for incoming connection requests. The user end of the connection is on a TCP port number above 1023. Suppose you wish to build a packet filter rule set allowing inbound and outbound SMTP traffic. You generate the following rule set:Rule Direction Src Addr Des

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