What is POP mail versus SMTP mail?
SMTP step-by-step: • Customer composes an e-mail message and sends it via their e-mail client’s SEND command. • The mail client references the outgoing/SMTP server hostname listed within its settings. It must then look up the IP address of the SMTP server via DNS. • The DNS server IP addresses are configured within the TCP/IP settings of the user’s operating system. After the SMTP IP address is found, the e-mail client telnets to the address via port 25. If the server is a valid SMTP host, a connection will be established. • The e-mail is then uploaded via a list of specific client/server SMTP commands. • It is now the job of the SMTP server to deliver the message to the intended recipient’s mail server. • The recipient’s domain is stripped from the e-mail address. • The server does a DNS lookup for the domain’s mail exchange or MX record. • The MX record denotes the mail server where a specific domain’s mail is housed. • Once the intended recipient’s mail server is found, the sender’s
