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What is email or mail "Daemon"?
The exchange of mail using TCP/IP
is performed by
MTA - (Message Transfer Agent) that defines how email message are transmitted between
two users.
See:
How
Email Works
Mail Daemon is a
software program residing inside (as a proxy)
standard mail server to manage
incoming and outgoing emails.
How the mail Daemon
program works when you send an email to ie: myfriends@aol.com
1. Your email software:
HELO my ISP mail server, I am sending you an email, it is to
myfriends@aol.com
2. Your ISPs mail
Daemon: OK, OK! You can leave it to me. HELO aol.com mail server!! Are
you there?
3. AOL.com mail Daemon:
Yes! What have you got for me?
4. Your ISPs mail
Daemon: It's a mail for myfriends@aol.com
Do you have myfriends there?
5. AOL.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 AOL.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, ie: 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.
HTTP - Hyper Text Transport
Protocol. URL is entered into a browser--it asks
DNS for the
IP Address
using the IP name in the URL, makes a TCP connection to
Port 80 of a remote
host specified by the IP address, connect to the web server, send a GET
command and the web server sends the
webpage, the browser close the
TCP connection and displays the webpage.
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