I am writing my experience with this question which may help few travelers. I have personally contacted at least 3 different border control authorities over email (in Europe) for questions regarding immigration.
In all cases, I contacted the Airport Helpdesk and asked them to redirect question to proper authorities. In all the time I got response from the border control authorities and I received the correct information.
So I would suggest, in case you could not find email/contact of appropriate authorities, just email to Airport helpdesk (where you are interested in contacting border control).
The competent bodies in each EU/Schengen state can be reached at the following e-mail addresses (mostly belonging to national departments, i.e. not a specific airport/crossing):
Credit:stackoverflow.com‘
5 Mar, 2024
4 Mar, 2024
5 Mar, 2024