We have run into instances where spammers have obtained valid email addresses and passwords from users. They get this information in multiple ways: through phishing schemes that people reply to, viruses/malware that capture keystrokes, etc. (This is why we tell users to never email their password to anyone. If we ever need your password we will call you.)

With this information, spammers can write programs to send tens of thousands of pieces of spam through our mail servers. This is bad for two reasons:

1. The increased load on our mail servers slows the delivery of email for all of our users.
2. It increases the likelihood one (or more) of our mail servers will be blacklisted. If this happens, other mail servers will refuse to accept email from us. Only after we contact the blacklist owner and get ourselves removed will email flow again.

Clickcha is a unique CAPTCHA system that is more secure than traditional text-based CAPTCHAs, yet easier to use. Clickcha will replaces the normal "Submit" button with an image-based CAPTCHA that requires a single click to solve and submit a form.

Clickcha generates image-based CAPTCHAs which require the user to click the image in a particular area to solve the puzzle. Clickcha is more secure than traditional text-based CAPTCHAs which can be read via OCR software.

Here is an example of the new webmail login page. In addition to the "Name" and "Password" prompts there is a Clickcha image. You will need to click the area of the image as instructed. In this example you would click inside the biggest box.

Note: Javascript must be enabled in your browser in order to see the Clickcha prompt. If you can not see the Clickcha prompt you will not be able to login to webmail.

For more information on Clickcha go to http://clickcha.com/.