[SM-PLUGINS] [Captcha Plugin] Captcha plugin on installation doesn't allow login even with correct entry for the CAPTCHA value

[Guruprasad <lgp...@gm...>]

Hi all,
I am upgrading Squirrelmail on my college mail server to the latest
stable version. I installed the CAPTCHA plugin for use in the login
page. But unfortunately whatever the CAPTCHA backend I use, I am
unable to login as I get a 'Sorry, you did not provide the correct
challenge response.' even when I enter the CAPTCHA text correctly.

The other plugins I have installed are:
1. calendar
2. filters
3. mail_fetch
4. delete_move_next
5. listcommands
6. sent_subfolders
7. message_details
8. bug_report
9. add_address
10. junkfolder
11. notes
12. email_footer
13. restrict_senders
14. bounce
15. archive_mail
16. reply_buttons
17. show_headers
18. cleanup
19. todo
20. captcha

I have created the 'config.php' for the CAPTCHA plugin as mentioned in
the INSTALL file of the plugin. Can someone help me to know what I am
doing wrong?

Thank you.

Regards,
Guruprasad.