You can design an email-wielding webbot to help you identify illegitimate members of a members-only website. If someone has access to a business-to-business website but is no longer employed by a company that uses the site, that person probably also lost access to his or her corporate email address; any email sent to that account will be returned as undeliverable. You could design a webbot that periodically sends some type of report to everyone who has access to the website. Any emails that return as undeliverable will alert you to a member’s email address that is no longer valid. Your webbot can then track these undeliverable emails and deactivate former employees from your list of members.