Mail.ru

Mail.ru is a free webmail service from Russia.

Postmaster pages
Mail.ru provides a postmaster page in Russian at postmaster.mail.ru. Based on current information they are working on a translated page, but it's not currently available. Using various online translation programs does work well enough for non Russian speakers to sign up.

Feedback loop
There is a FBL provided at FBL signup. Users must create a mail.ru account in order to sign up for the FBL, but as mail.ru is a free service, this isn't a big deal. Again, there is no current translation, but online translation tools work well enough for users to signup and manage the data.