Choose New mail above the folder list. A new message form opens in the reading pane.

At the top of the message, choose  > Show From.

This option shows you that the people who receive the email message will see it comes from the shared mailbox and not from your own email account.

The first time you use the shared mailbox, you need to add the address to the options available in the From drop-down list:

1. Right-click the From address and choose Remove.

   

2. Type the shared address. The next time you reply from the shared mailbox, its address will appear as an option in the From drop-down list.

To add recipients, type the name of anyone who is in your contacts folder or organization’s address list, or type the email address in the To or Cc box. The first time you enter a person’s name, Outlook on the web searches for that person’s address. In the future, the name is cached so it resolves quickly.

Type a subject.

Type the message you want to send.

When your message is ready to go, click Send.