The New York Times’ Saul Hansell reports today that both AOL and Yahoo — the two biggest providers of e-mail services on the planet — are considerig a plan to start charging companies who want to send out bulk e-mail a fee. Hansell says it could cost between 0.25 cents and a penny for those kinds of messages. But here’s the catch: Individual e-mail account holders could end up having to pay also if they respond to certain kinds of commercial e-mail.