Install Squirrelmail

What is Squirrelmail ?

SquirrelMail is a standards-based webmail package written in PHP. It includes built-in pure PHP support for the IMAP and SMTP protocols, and all pages render in pure HTML 4.0 (with no JavaScript required) for maximum compatibility across browsers. It has very few requirements and is very easy to configure and install. SquirrelMail has all the functionality you would want from an email client, including strong MIME support, address books, and folder manipulation.

Install Squirrelmail Webmail

$cd /usr/ports/mail/squirrelmail
$make install clean

Configure Squirrelmail

$cp -R /usr/local/www/squirrelmail /var/www/html/webmail
$cd /var/www/html/webmail/config
$./conf.pl

type option 2
type option A
type option 6 for auth type "login"
type option 8 and type courier

type option B
type option 7 for smtp auth "login"
type S to save
type Q to quit

You can access your webmail from http://10.10.10.10/webmail, Change it into your website url/ your server ip address.

Install Change Password Plugins for Squirelmail

$cd /var/www/html/webmail/plugins
$wget http://www.squirrelmail.org/plugins/change_pass-3.1-1.4.0.tar.gz
$tar -zxvf change_pass-3.1-1.4.0.tar.gz

Activate Change Pass Plugins

$cd /var/www/html/webmail/config
$./conf.pl

type option 8 for plugins

SquirrelMail Configuration : Read: config.php (1.4.x)
---------------------------------------------------------
Plugins
Installed Plugins
1. calendar

Available Plugins:
2. administrator
3. bug_report
4. change_pass
5. delete_move_next
6. demo
7. filters
8. fortune
9. info
10. listcommands
11. mail_fetch
12. message_details
13. newmail
14. sent_subfolders
15. spamcop
16. squirrelspell
17. test
18. translate

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

Command >>

type 4 to activate change_pass
type S to save your webmail config
type Q to quit

After everything is configured correctly.
you can try to change your password through webmail