This is where all your send to a friends are kept, you may wish to have multiples due to different branding or settings.

The reason to set up a send to a friend is you want the friends to opt in to your marketing to increase your subscribers. Setting the send to a friend clearly in your design at the top and bottom of your design is helpful. Email recipients often use their inbox forward to pass content on to their friends which misses your opt in process and also means all tracking and cookied information will relate to the original recipient's details and not the friend that has been forwarded the email.