I've used K9 for a few years, and have only had this problem since getting a Huawei P8 Lite 2017 running Android 7.0. Several times a day I get a notification saying "Authentication failure. Please check your settings and try again". As soon as I open K9 the notification disappears and I am able to refresh my mail without a problem. The problem is that while this error message is there I won't receive any new mail. Has anyone else had this problem? Is there a solution? Thanks.
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