Lists may also be defined as 'receives new subscriptions' and/or 'receives new referrals'.

A list defined as 'receives new subscriptions' is nominated as the initial list into which all new subscriptions from your website's subscription form takes place, whilst 'receives new referrals' is the list nominated to collect new referrals from messages forwarded to friends/colleagues. Note that referrals are tracked but not automatically added to your list of subscriptions. The recipient of a referred message MUST click a link in the message header in order to confirm their subscription.