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Blocked/Ignored Users appearing in Yahoo roster

I have noticed that if I do NOT have a user in my roster, but have added them to my blocked user list using the Yahoo client, they will appear when fetching the roster in my Jabber client.

To reproduce:

  1. Create two Yahoo IM accounts with empty rosters. I’m calling them “user A” and “user B”.

  2. Log in as user A using the Yahoo official client

  3. Log in as user B using the Yahoo official client on another machine

  4. Send a message from user A to user B

  5. Add user A to user B’s ignore list by clicking on the “Ignore” button in the Yahoo chat window of user B

  6. Log in to the gateway as user B

  7. Notice that user A appears in the roster of user B even though it was never added to it at any time

I am assuming that Yahoo sends a list of “blocked” contacts and the gateway is interpreting them as roster contacts. Is this the case?

Thanks!