1) Ralph - to manage your mailman3 email addresses - login to your mailman account - in top right drop down under your 'username' -> account
there you'll find 'email addresses' which you can add/remove.2) As an aside, I note that while yahoo.com has p=reject policy, gmail.com does not - gmail dmarc policy is 'p=none' (but google.com uses p=reject).
So using a gmail account should also work with the lists until they get sorted out.
gene