SquirrelMailはPHPで記述されたWebMailです。
FedoraCoreに含まれるパッケージから日本語にも対応するようになりました。

1.SquirrelMailのインストール

# rpm -ihv squirrelmail-1.4.0-1.noarch.rpm
警告: squirrelmail-1.4.0-1.noarch.rpm: V3 DSA signature: NOKEY, key ID *****
Preparing... ########################################### [100%]
1:squirrelmail ########################################### [100%]

SquirrelMailのディレクトリ構造

/etc/squirrelmail/config.php 設定ファイル
/etc/httpd/conf.d/squirrelmail.conf Apache設定ファイル
/usr/share/squirrelmail/* PHPプログラム郡
/var/spool/squirrelmaill/attache/* メールの添付処理

1−1Apacheの設定ファイル

# vi /etc/httpd/conf.d/squirrelmail.conf

記載の確認

#
# SquirrelMail is a webmail package written in PHP.
#

Alias /webmail /usr/share/squirrelmail

OKであれば、Apacheの再起動

# /etc/rc.d/init.d/httpd reload
httpdを再読み込み中: [ OK ]

1−2Squirrelmailの設定(日本語表記)

# /usr/share/squirrelmail/config/conf.pl

SquirrelMail Configuration : Read: config.php (1.4.0)
---------------------------------------------------------
Main Menu --
1. Organization Preferences
2. Server Settings
3. Folder Defaults
4. General Options
5. Themes
6. Address Books (LDAP)
7. Message of the Day (MOTD)
8. Plugins
9. Database

D. Set pre-defined settings for specific IMAP servers

C. Turn color off
S Save data
Q Quit

Command >>1

SquirrelMail Configuration : Read: config.php (1.4.0)
---------------------------------------------------------
Organization Preferences
1. Organization Name : SquirrelMail
2. Organization Logo : ../images/sm_logo.png
3. Org. Logo Width/Height : (308/111)
4. Organization Title : SquirrelMail $version
5. Signout Page :
6. Default Language : en_US
7. Top Frame : _top
8. Provider link : http://www.squirrelmail.org/
9. Provider name : SquirrelMail

R Return to Main Menu
C. Turn color off
S Save data
Q Quit

Command >> 6

SquirrelMail attempts to set the language in many ways. If it
can not figure it out in another way, it will default to this
language. Please use the code for the desired language.

[en_US]: ja_JP
SquirrelMail Configuration : Read: config.php (1.4.0)
---------------------------------------------------------
Organization Preferences
1. Organization Name : SquirrelMail
2. Organization Logo : ../images/sm_logo.png
3. Org. Logo Width/Height : (308/111)
4. Organization Title : SquirrelMail $version
5. Signout Page :
6. Default Language : ja_JP
7. Top Frame : _top
8. Provider link : http://www.squirrelmail.org/
9. Provider name : SquirrelMail

R Return to Main Menu
C. Turn color off
S Save data
Q Quit

Command >> S
SquirrelMail Configuration : Read: config.php (1.4.0)
---------------------------------------------------------
Organization Preferences
1. Organization Name : SquirrelMail
2. Organization Logo : ../images/sm_logo.png
3. Org. Logo Width/Height : (308/111)
4. Organization Title : SquirrelMail $version
5. Signout Page :
6. Default Language : ja_JP
7. Top Frame : _top
8. Provider link : http://www.squirrelmail.org/
9. Provider name : SquirrelMail

R Return to Main Menu
C. Turn color off
S Save data
Q Quit

Command >> Q

1−3Squirrelmailへアクセス