Hi,
I received (yesterday) email from EasyJet:
As a result of new legislation from the EU, all passengers travelling from the UK and Switzerland to Spain on flights departing 11 June onwards are required to provide Additional Passenger Information (API) before they travel.
One or more destinations in your booking above require you to provide the date of birth, nationality and passport or national identity card details for each passenger on the booking......... If the information supplied is incomplete, inaccurate or does not match the documents presented for travel, the affected members of your travelling party will not be allowed to take their flight.
So everyone, who has bought tickets to Ibiza in EasyJest musts logon on easyjet www and add this extra information.