Odd checkbox next to my dock

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Mac Mini i5 (2014 High Sierra), iPhone X, Apple Watch, iPad Pro 12.9, AppleTV (4)
Looks like you're running some kind of dock customisation that's the first place i'd look.

Also check what apps are running at startup: System Preferences - Accounts/Users - Login Items
 
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Main-11" Air, iPhone 6+, iPad Mini 3, Hi-Fi Extras- Too many to count
Could it be part of your wall paper?
 
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Z
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I just noticed when I use my hotcorners to show all windows, the checkmark comes together with my mail icon as an open application. I will try to poke around my mail settings, but I haven't changed anything recently, so I hope I find something! Thanks for the suggestions!
 
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Mac Mini i5 (2014 High Sierra), iPhone X, Apple Watch, iPad Pro 12.9, AppleTV (4)
Don't know of anything in mail settings to do that I'd definitely say it's some customisation tool you have running
 

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