Getting email from shared mailbox

There is a shared mailbox that I have the option to send mail on behalf of, but I have been receiving mail on behalf of it as well.

I never used to, it seems to have started out of the blue. Also it seems that I am only getting meeting request accept notifications.

There is a rule of the shared mailbox that automatically clears out the accept notifications, but once in a while for an unknown reason one will stay in the mailbox and not be cleared out - when this happens I get the same meeting request accept in my mailbox as well.

No one else who shares the mailbox is getting this.

How can I turn this off so that I don't receive any email on the other mailbox's behalf ?

 

outlook 2003 with updates.

Thanks