After an email message is sent, you can resend the same message. This is useful if one or more of the message recipients tell you that they didn't receive the first message, or you want to quickly send the message to new recipients.
In Mail, in the Navigation Pane, click Sent Items.
Double-click the message that you want to resend.
On the Message tab, in the Move group, click Actions, and then click Resend This Message.
A new message window opens. If there are multiple recipients, you can remove recipients who don’t need to receive the message again. Click the names that you want to remove, and then press DELETE.
Tip: You can also add recipients who weren’t on the original message, add or remove attachments, and change the contents of the message.
Note: If you want to resend multiple messages, you must do so one at a time. Repeat these instructions for each message.