Since bug #252 (authentication does not work with email address) seems hard to fix, and since time and again users report that they forgot their Mageia UIDs:

Would it be possible to let the password reset mails from identity.mageia.org contain the matching username/uid?

Known workarounds:

* Users who forgot their user name, but remember having posted in the forums or having edited a wiki page, can find their username/uid in the matching forums thread or in the history of that wiki page.

* Users who have logged into the wiki (page editing not needed) and remember around which date they did that for the first time, can search the wiki users list by creation date:
https://wiki.mageia.org/mw-en/index.php?title=Special:ListUsers&offset=&limit=500&username=&group=&creationSort=1