Help Center How it works
The working of MailHASH in a nutshell is the following.
A Javascript is called with a unique hash as parameter. If the hash belongs to the URL calling, all goes as expected. If the hash doesn't match the URL the visitor will see an warning message.
When a visitor clicks on a link with a mailhash, this is sent to the Javascript function that has been included.
This function will the once again check the URL against the hash, if this is successful it will as a remote script to decode the mail hash. The remote script wil then return the e-mailaddress and this is returned by the javascript function in a mailto: link.
The final step also checks if this is not called by one of the 137 known crawlers/spiders.