I don't know about other subscribers to this mailing list, but I just received a password reminder email for Wikimedia mailing lists, despite never having received one before, ever. This is probably an unintentional change brought about by the changes to the mailing lists in January.
To turn this back off, visit the WikiEN-l list information page at the following URL:
http://lists.wikimedia.org/mailman/listinfo/wikien-l
Type your email address in the box under "Changing options and unsubscribing" and click "Unsubscribe or edit options". Type in your password on the next screen and hit "Log in". Scroll down to "Get password reminder email for this list?", click "no", and click "Set globally" if you want to turn it off for all Wikimedia mailing lists you are subscribed to with that email address.
Then click "Submit my changes" at the bottom of the screen.
Voila! No more getting your passwords emailed to you in plain text (which I, for one, think is the stupidest feature of MailMan ever).
~Mark Ryan