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CHAPTER 3
Chapter 3: Incoming Mail with
POP and IMAP
Postfix
will receive e-mail and deliver it to the user's inbox, but additional
software is required to read it with ease. There are two standards for
retrieval of e-mail from a host. The first is called Post Office
Protocol (POP). POP3 is most commonly used. This is normally used to
read e-mail from the server, store it in a client application, and
remove the e-mail from the server. This is often used by Internet
Service Providers (ISPs). The e-mail is subsequently manipulated by the
client application, for example, Outlook Express or Mozilla Thunderbird.
The second protocol is called Internet Message Access Protocol (IMAP).
The IMAP system is usually used when the e-mail is to stay on the
server. IMAP allows users to create folders for e-mail and to move or
copy e-mail between the folders. The client application accesses the
e-mail on the server, but does not have to store it on the client
machine. The e-mail server must be able to store all of the e-mail for
all of its users, and the amount of data is expected to grow
constantly—users rarely delete e-mail. IMAP is therefore more frequently
used in large organizations with centralized IT facilities.
There are many POP3 and IMAP servers. Some perform only one of the
tasks. The Courier-IMAP suite of software contains both a POP3 and IMAP
servers, and is covered in detail in this chapter.
Courier-IMAP operates by accessing the maildir of the user. An overview
of the operation is shown on the following page:
- Chapter 3: Incoming Mail with POP
and IMAP
- Downloading and Installing Courier- IMAP
- Installing Courier-IMAP from RPM
- Installing Courier-IMAP from Source
- Prerequisites
- Installing Versions below Courier-IMAP 4.0 from
Source
- Building the Courier Authentication Library
- Resolving Errors
- Building Courier-IMAP
Using POP3
- Configuring Courier-IMAP for POP3
- Testing the POP3 Service
- Retrieving E-mail via POP3 with Outlook Express
Using IMAP
- Configuring Courier for IMAP
- Testing the IMAP Service
- Retrieving Mail via IMAP with Mozilla Thunderbird
Summary
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Paperback,
295 pages
Released: July 2005
ISBN: 190481137X
Authors: Alistair McDonald,
Carl Taylor, Magnus Bäck, David Rusenko, Ralf
Hildebrandt, Patrick Ben Koetter |
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Introduction
1: Linux and E-Mail Basics
2: Setting Up Postfix
3: Incoming Mail with POP and IMAP
4: Providing Webmail Access 
Free Chapter
5: Securing Your Installation
6: Getting Started with Procmail
7: Advanced Procmail
8: Busting Spam with SpamAssassin
9: Antivirus Protection
10: Backing Up Your System
Index
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View the book details
on PacktPub.com
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