FWIW this link (https://nmweb.evenmere.org/show/CACMMjMLecmXopb8AATjE3UuCnNLOO%2B5Nmev5X8K-UostDEUdrQ%40mail.gmail.com) has the tag attachment applied to the message, but there is no attachment shown. And another (https://nmweb.evenmere.org/show/87d31artti.fsf%40inf-8657.int-evry.fr).