unsubscribing from a Yahoo group

  jack O'lantern 12:31 01 Jan 11
Locked

I have changed my ISP and have advised the list owner of a Yahoo group of the change.
All well and good - - eventually- but was advised to post and unsubscribe message to the group on my old E-mail addy.
Seemingly not possible now - I can get web mail- but the compose box stays closed.
So I wonder- especially as the ISP is shotly to close down any way - is it important to do this?
Will there be a clutter of bounced mails coming into the list owners in box?

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