How is email transferred between the Client and the Mail Server?
When the Email Client sends a message, it first finds the Mail Server using the Domain Name Systems (DNS)*. Contact with the Mail Server is accomplished using the “Simple Mail Transfer Protocol (SMTP). After the Client contacts the Mail Server, the message is then sent; the Email Client will then send any other pending messages or if it is done it will log off from the Mail Server. The collection of email messages by the Email Client is similar. The Client uses the “Post Office Protocol” (POP) to send an account name (user name) and a password to the Mail Server so it knows for whom to collect outstanding messages, which are then collected one at a time. Note: On a local network there may not be a DNS server; in which case the Mail Server is referred to by its actual IP address rather than by a Domain Name.
