Planhat supports both a one-time push and continuous sync with MailChimp. A one-time sync allows you to filter and select End Users in Planhat and push them to a specific list in MailChimp. Continuous sync creates a mapping between a filter in Planhat and a list in MailChimp, meaning that Planhat will add and remove End Users from the linked MailChimp list as they are added and removed from the linked Planhat filter. Sync occurs at least once every hour.