This is a great app. Have been using it for years. However with the last update  K9 keeps giving me (and my wife) authentication failed messages even when I re-enter passwords. I even tried changing passwords for two email accounts. The constant notifications are pretty annoying and have finally had to block k9 notifications. Is there a way to roll back to the previous update? I still give you five stars for outstanding work. Thanks.
December 31 2016