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1. Your email software: HELO my ISP mail server, I am sending you an email, it is to myfriends@Gmail.com 2. Your ISPs mail Daemon: OK, OK! You can leave it to me. HELO Gmail.com mail server!! Are you there? 3. Gmail.com mail Daemon: Yes! What have you got for me? 4. Your ISPs mail Daemon: It's a mail for myfriends@Gmail.com Do you have myfriends there? 5. Gmail.com mail Daemon: Hang on.... No! myfriends not here. 6. Your ISPs mail Daemon: OK, QUIT 7. Your ISPs mail Daemon return a copy of the bounced mail from Gmail.com mail Daemon to you, together with the undeliverable error message with an email address that may looks like this: maildaemon@yourISP.com Notes: There are also various other Daemons programs like; ftp daemons that manage "file transfer" or HTTP daemons that manage request for web pages on a web server. FTP - File Transfer Protocol, are software programs that let users transfer files across the Internet (upload or download files). The most common ways to access a FTP is through a "browser", an FTP program or by issuing FTP commands at a text-based command prompt.
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