What email client are you using? What exactly happens when you attempt to send mail using your email client? What exactly happens when you attempt to send mail using Yahoo! mail? Do you receive any error messages? Does other mail go through OK?
i send an e mail to my friend (he used aol mailbox) but cannot be delivered whenever he turn off his pc.then i send another e mail using his yahoo mailbox,same thing happened.however,whenever he's online the mail can be delivered.whats happening?help!