enquiries.org
It’s the word on the sign above the desk, on the email address, and on the phone line, in every British and Commonwealth institution. Ubiquity of that order is what makes a plain noun valuable.
The extension matters more than usual here. Councils, universities, charities, professional bodies and health organisations are simultaneously the heaviest users of the word and the heaviest users of the .org, which makes them the obvious buyers.
It suits a contact and helpdesk platform, a lead routing product, a public information service, an ombudsman or advice body, or a shared enquiry line serving several member organisations.
The British spelling is a feature rather than a limitation. It targets a large market precisely, and it’s the spelling used across the UK, Ireland, Australia, New Zealand, India and much of Africa and Southeast Asia.
The name is listed. Offers welcome.