Recover Email from Username

I am trying to recover an account based on the username, but I can’t seem to recall what email address I had for that username as I believe I may have used an old one.

Is there any way to verify even partially the email address associated to an Username? I “believe” I had the username but it was a super old account so I am not sure I have the email anymore.

Can anyone from Plex confirm even partially some sections on the email address, like first 3 and last 3 characters or something?

Contact Plex Billing: https://www.plex.tv/contact/?option=billing-issues#p-contact

It was never a paid account but I have sent them a message anyways to see if they can assist.

Thanks.