Elinor,
Did you post this before or after you left the group with one of your email addresses and then changed your email address on the other one?

If you posted this before, then I think what you did should work.

If you posted this after, then you probably need to wait up to 48 hours. Sometimes it takes a while for a change to take place. I had an incident when I unsubscribed from a list and kept getting email from the list for a week afterwards.

If worse comes to worse, you could completely unsubscribe and wait a day to make sure you aren't getting any, then sign up on the list again. You could read the emails you missed on the list web site.

but if I were you I would wait a couple days and see if it starts working right before I tried anything else

Kitty