Mail forwarding is a service that automatically redirects emails received at one email address to another specified email address. When mail forwarding is set up, any email sent to the original email address is automatically forwarded or redirected to the designated forwarding address. This can be useful for consolidating multiple email accounts into one inbox, ensuring that all messages are easily accessible from a single location. Additionally, mail forwarding can be used to temporarily redirect emails while transitioning to a new email address or to ensure that important messages are promptly received even when using multiple email accounts.