You check the mailing list archives - those usually have a web based interface.

Admittedly I was being facetious: OP said mailing lists are better than a forum, but for searching the archive you need a forum-like interface anyway.

	▲	m4rtink 4 hours ago \| parent [-]
		Its a bit easier as it can be read-only & static generated. Though there are some attempts to make it possible to reply using the Web interface, like HyperKitty /Mailman 3.