What are groups and sources?
Groups are sets of contacts to which messages are sent. A contact may be a member of more than one group but a contact will not receive the same email twice. Groups are also fully editable: you can merge two or more groups into one while either retaining or deleting the existing groups. Sources are literally the origin of contact information used in order to facilitate performance analysis according to source. If you find that a source of contacts performs poorly, with more than the expected amount of invalid records, you can export these to CSV and send to your supplier for a refund or exchange.
