first briefly introduce the mail,, mainly consists of two parts: SMTP protocol (Simple Mail Transfer Protocol) and POP3 (post office protocol version3), SMTP for message delivery in (Mailer),, receiving and processing the pop mail client. Because of the limitations of the POP3, the future will certainly be replaced by IMAP, IMAP had better directory service ability, can see the main information sources,, such as mail the title before downloading and so on, can also remotely delete messages,, but the ISP is not easy to use it to replace the pop. and the IAP POP take care not to confuse,,all the players imm, the
is the current access point (Point OfPresent). The more you learn the more confused: - (
most early in the Linux to deliver the message using the SMTP service, you can see in the /etc/inetd.conf,, this line:
#smtp stream TCP nowait root /usr/bin/smtpd smtpd
now basically use sendmail powerful Deamon to do (such as NNTP). So sendmail just mail transfer (Mailer),let FONT-SIZE: 22pt,With the rapid deve; mso-bidi-font-size:, it sends the host mail to other places, pay attention to configure the DNS with a MX (MaileXchang, mail gateway), the use of sendmail to have a DNS in your network. While the processing host remote client mail service to pop service,, see the inetd.conf there are so few:
pop-2
stream TCP nowait root /usr/sbin/tcpd ipop2d
pop-3 stream TCP nowait
root /usr/sbin/tcpd ipop3d
imap stream TCP nowait root
/usr/sbin/tcpd IMAP
to view the /etc/service knew their corresponding port number, using telnet host-name port to try to see what? Something like Linux is usually used to do service,, of course,, there are many people use it as a desktop is also good, but beginners don't know how to get them in the ISP mail,, is actually very simple,, only need to install a pop/imap client software on the line,, netscape>