[Mailman-Users] Weird membership reminder

[Paolo]

Hi all, I'm not a Mailman expert, so I apologize if my question has no sense.

I have unsubscribed from a list one years ago or more. Today has
arrived a mail with this subject: Membership reminder

and this body:

Your password: xxxxxxx

Request made by IP 127.0.0.1 at 2005/07/29 16:50:25.305 GMT+2

where xxxxxxx is the password I gave during subscription.

What's up?

Thanks