The Wikimedia RU mailing list description page shows up with broken encoding when first opened:

This is because the description is in Russian, and it's probably not Unicode and Mailman is not configured to send the correct encoding header.

It can be fixed manually by the reader using browsers' encoding settings, and it was quite common to do such things in the 1990s, but these days best practices in web development have ways to avoid this weird step. It would be nice if our Mailman could be configured to fix it.