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Shut Down Is Stopped When Mail App Is Open, Is There a Workaround?

I am setting up my iMac (High Sierra) to shutdown when it goes onto uninterruptible power supply (UPS) during power outages. When I shut routinely down my iMac, I get a message that shut down was stopped because Mail is open. I know the simple solution is to simply not open mail unless I need it open. I have other iOS devices I can use for mail tasks. Is there a setting I can change to prevent Mail from stopping the shut down? (BTW, I get many power outages where I live, several a week).
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Mike W

Comments: 3 Responses to “Shut Down Is Stopped When Mail App Is Open, Is There a Workaround?”

    7 months ago

    Are you sure that Mail will stop the shutdown process when there is a power outage? Getting a signal from the UPS that it needs to shut down is different than simply choosing to shut down manually. It may override the message.

    But on the other hand, I’m wondering why you get that message. Unless you have a unsaved document or something like that, and app should quit on its own when you shut down. What does the message say exactly?

    Mike W
    7 months ago

    Like a squeaky door in a car, doesn’t happen when you want it to. The next time the “can’t shut down” notice appears, I will update this report. For the moment, a shut down goes normally even when mail,is open. I am awaiting the delivery of a new APC UPS next week. When that is set up, I can check how the shut down works.

    Mike W
    7 months ago

    I’m unable to reproduce the mail app stopping shut down. If it ever happens I will report it. However, I was successful in getting a new UPS device to shut down the iMac. I have an APC model SMC1500I. I used the energy settings to configure the shutdown when on backup power. Worked just fine, nothing prevented the shutdown.

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