From version 1.1.67 of the import add on we handle redirects automatically, should the desired URL format be met.
For Jupix customers
Simply get mailouts to link to you homepage followed by '?profileID=X' (i.e. https://your-site.com?profileID=X)
For everyone else
Simply get mailouts to link to you homepage followed by '?imported_id=X' (i.e. https://your-site.com?imported_id=X)
In both of the above examples, 'X' is the unique identifier sent by the third party.