there is a change in the announcement of new incoming emails. Back in the days when a new email arrived there was one and only one announcement for this new email. That was OK. I did not change anything in the configuration of Thunderbird. Now in version 78.8.1 when a new email arrives, an announcement is made every minute until you've read the specific email! This is driving me crazy and I cant find a way to change it. Please help somebody!