In reply to:
isn't going to be as effective as the Captcha.
But if it is OFTEN so difficult to read so that it PREVENTS sending out any emails, you might as well just close down Squirrelmail!!
Before now it has taken me upto 6 attempts to send a valid email - sorry, but I want a working email system, I do NOT have the time to play silly games of "Guess the Graphic"!!
It is noticeable that you DON'T put that same constraint on someone using the mail2web interface.
Before anyone asks, the mail2web interface is far better at receiving/sending emails, but it DOESN'T let you check/manage the Spam Folder to retrieve those emails that have been wrongly sent to the Spam Folder!!