With the Donor portal opened on FRUP, Donors would be able to update their emails at any time. However FRUP does not send any notification to CiviCRM on Contact update, we only know about this change on the next donation import.
We need to update the contact on CiviCRM when the donor contact details changes, using the donor external identifier.
This task specifically refers to times where we see a change come across on the audit file with a new donation.