Anyone can buy a domain for a few pounds....... just because the email is @international pilots.com instead of @hotmail.com means nothing
These petty bureaucratic hurdles annoy and have no benefit. In the UK you can kick back against excessive data requests as all data has to be necessary and proportionate, but the use of 'work emails' whatever they might be are best circumvented. GoDaddy is offering a year's service for £3. Takes about 10 minutes. If these people want to be silly, be silly back. I see 'pilotlicensing.com' is available
