The simple way to switch from Mail to Gmail
One nice thing about Mail is the Redirect feature, which lets you forward mail to a particular address so that it does not appear to have been forwarded from you. The final recipient sees the message just as you did when it arrived in your inbox.
One annoying thing about Mailâs Redirect feature is that it cannot be used on more than one message at a time. You canât select, say, the entire contents of one mailbox and tell Mail to redirect all those messages to your Gmail account. If you select more than one message, the Redirect menu item is unusable. Here's the solution.