How to reply to mail sent to the shared mailbox
Reply to mail sent to the shared mailbox
Open the email message you want to reply to.
From field at the top of your message, you should see the name of your shared mailbox. If you don't, choose the From dropdown box and choose your shared mailbox.
Finish typing your message and then choose Send.
When you want to send a message from your shared mailbox, the address will be available in your From drop down list.
Whenever you send a message from your shared mailbox, your recipients will only see the shared email address in the message.