Implement redirect of email to another recipient as described here:

• add funcion to forward an email as redirection through sender, asking only the recipient

• prepare a clone of the original email adding “Resent-From:” header with the email of the user redirecting, eventually other Resent headers as described, and set recipient of the email to the new other recipient

• send the email

The user receiving the redirected email will see it as a normal incoming email from the original sender, so the message view must then implement redirection detection by checking for “Resent-…” headers and show the “through <Resent-from>” on the right of the original sender.

The user receiving the redirected email will be able to answare to the original sender using normal reply functions.