Abstract: A method of inquiring status of a sent e-mail includes displaying a screen of e-mail list having records each including size, subject, sending time, success times, failure times, and times to be sent; clicking the e-mail in the list to enter a screen about details of sent e-mails including a success sending portion and a failure sending portion including status description for indicating the cause of failure; linking the status description to enter a description screen including a flowchart for illustrating steps of the e-mail sending wherein the step is highlighted if an error is occurred therein and a corresponding description is shown; and showing an icon in an area on a computer screen for indicating whether the sent e-mail is a success or not. The sender is able to immediately send the failed e-mail again after correcting the error as shown.