If you accidentally sent an email to a wrong person, or you realize you have sent a wrong email to someone, you can recall and delete the email if the person did not open it yet.
Step 1: Click "Sent Items" from the folders;
Step 2: Double click the message you want to recall to open it in a separate window;
Step 3: In the message window, click on "Actions";
Step 4: Click "Recall This Message" from the drop-down list;
Step 5: In the "Recall This Message" window, select "Delete unread copies of this message", and click "OK" at the bottom;
If you have another correct email ready, you can also click "Delete unread copies and replace with a new message".
Step 6: You will receive the notice of recall success or failure after a while.