A few requests come up often, and for those there is a faster route than email. A machine, source or material missing from the catalogue: use the catalogue requests page, where the request is tracked and visible. A dangerous setting or an off-topic photo: use the report form, which is reviewed by hand. A lost password: use the reset link on the login page.
For everything else, this form is the right place: a question about a Premium pass or an invoice, a refund, a mistake spotted on the site, a partnership proposal, a press enquiry, or a legal question (copyright, personal data, legal notices).
Two tips for a useful first answer. State your machine, source and material when the question is about a setting: without those three, no serious answer is possible. And give the email address of your account if your request concerns a purchase, so the sale can be found.
We correspond in French or English. Account and personal data deletion requests are handled without any justification required, in line with the site's legal notices.