[TYPO3-ect] Sr_Free Captcha

[Prudhvi Krishna Vecha(Vedicsys)]

Hi There,
I am using Sr_Free captcha extension for displaying captcha on web forms
and I am using powermail extention for forms. This captcha extension
showing strings on image mixing alphabets of capitals and smalls, in one
specific example it showing Zxxxui for this I entered zxxxui its taking
without giving any error. Can you please suggest how to make it correct
validating.
Thanks,

With Regards
------------------------
Prudhvi Krishna