On Fri, Sep 16, 2016 at 1:13 AM, jeandet <alexis.jeandet@member.fsf.org> wrote:
Failed to login to the server: Daily Limit Exceeded. The quota will be reset at midnight Pacific Time (PT). You may monitor your quota usage and adjust limits in the API Console: https://console.developers.google.com/apis/api/caldav/quotas?project=923794261470

Google is actively trying to discourage IMAP use. I have heard reports that they deliberately have it fail randomly to aid in this.

We have also seen the daily limit problem. In one case, we could find no reason why this was happening to one of our users, and it kept up for a couple of days before it stopped happening without us or the user having done a thing. In another case, the user did have an Android phone enabled to access the Google account via IMAP, and when she turned that off, the limit issue went away. (On phones, there is really no reason to use an IMAP client, since there are Gmail-specific apps that generally work quite well).

--Greg