AOL and Yahoo! are to start charging for sending emails. Both companies will still accept free emails but are offering the chance to pay to avoid their spam filters. By paying between a quarter and one cent per message companies will get preferential delivery of their messages. So a "business class" email will go straight to an AOL-subscriber's inbox marked with a stamp saying "AOL Certified Email" while a free email will have to run the gamut of AOL spam filters. Free mails may also have images and web links removed.