Any email address posted on a web site as plain text or a mailto link will be harvested by spambots and added to lists of email addresses sold to spammers. This includes not only addresses on web pages, but also those in comments and forum discussions. The best way to prevent this is to set up a script on the server to obscure all email addresses site wide in a way that they are hidden from spam bots but still accessible to human users.
A simple solution is to encode the email address with html entities as explained on this encoder page. The danger with this simple solution is that it would not be difficult for spammers to create spambots that will look for and convert these encoded email address.
Posted by Ken in General