On MacOS mail (Catalina, but also on 10.14), I've noticed that the client never finished downloading mail from my cPanel/WHM-based server (which has support for Apple Push for iOS, for what it is worth). The mail will come in and be readable, but it will keep saying "Downloading Messages" in the status area and the Activity window (the activity window will show it downloading, say, "Message 12 of 12."). Because it gets stuck like this, I never receive notifications when messages come in -- unless the Internet goes down and then suddenly I get a rush of notifications for everything that came in recently. I've noticed this problem on multiple different computers (a 2015 15" MacBook Pro and now a 2019 16" MacBook Pro) and on multiple networks.

With this, I am almost always seeing Mail listed as drawing significant power on the little menu bar icon for the battery.

  • What do you see in Connection Doctor, in Windows menu ? – ankii Jan 17 at 1:59
  • All of the accounts' status icons are OK/green. If I enable connection logging, I see a lot of stuff whirling by, but no error messages stand out. It will show logging into the server every so often (maybe every minute or so?), "ENABLED QRESYNC," and then "LOGOUT," all under a second. – Timothy R. Butler Jan 17 at 3:17
  • Had this once. Eventually I found there was one older message causing this. I deleted it, then the problem was gone. – not2savvy Jan 18 at 22:08
  • @not2savvy, how did you figure out which message was the problem? – Timothy R. Butler Jan 20 at 4:41
  • I moved the messages to a local mail folder, day by day backward from today until the problem symptom disappeared. Then I moved them back – except for the weird one, of course. – not2savvy Jan 20 at 11:14

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