Hi,
Can any one please help me out in implementing Captcha in lotus notes.If any one has code for that , it would be grateful…
Thanks in Advance
Regards,
Jil.
Subject: CAPTCHA for Domino web forms
You can implement CAPTCHA in Domino web forms using simply Notes formula language. 
CAPTCHA for Domino web forms - Security Image Generator
http://www.notesmail.com/home.nsf/tip20100506
Here’s an example of a web site where it has been implemented if you would like
to test it: NotesMail - Download Evaluation Software - CRUCIAL Notes Tools and apps - HCL Business Partner
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Subject: RE: CAPTCHA for Domino web forms
i found this, hope this will help
Subject: How to implement Captcha in lotus notes
Read my BLOG to learn about implementing CAPTCHA with Domino : Chris A. Brandlehner BLOG | Implementing a CAPTCHA with IBM Lotus Domino
Subject: How to implement Captcha in lotus notes
Jil,
You could do a primitive “roll-yer-own” sort of captcha where it always uses the same image and response string. This will still screen out 99.99% of your spammers.