
Configuring POP3 and IMAP Mail Delivery Agents
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Configuring POP3 and IMAP Mail Delivery Agents
In this section we’ll add email delivery agents to complement Postfix. Use the follow-
ing command on Debian to add an IMAP and a POP3 server:
# apt-get install ipopd-ssl uw-imapd-ssl
We’ve chosen ipopd-ssl to provide POP2 and POP3 mail delivery agents and uw-
imapd-ssl for IMAP. Don’t let the ssl suffixes fool you—both packages provide un-
encrypted services as well as encrypted ones. Standard IMAP uses port 143, and
POP3 uses port 110. The encrypted protocols and ports are POP3S (port 995) and
IMAPS (port 993).
Originally from the University of Washington, the ipopd-ssl package is now main-
tained by Debian. You just need to install it; it basically configures itself to use the
home mail directory that exists on a mail server like the one we set up in Chapter 4.
ISPs continue to use POP3, but it is rarely used in enterprises.
uw-imapd-ssl provides an IMAP server. Although it requires more disk space, IMAP
is superior to POP because it leaves mail on the server and allows users to view mes-
sages from any location that has Internet access and a mail client. We don’t know of
any current mail clients unable to understand IMAP, so most mail users will want to
use it.
You can also provide webmail on your mail server using SSL (https), making it conve-
nient for users to access their email from a web browser. ...