Fix Mail Problems
As I said earlier in this book, the macOS version of Mail has a number of reliability and behavior problems, and many of them are things you can’t fix, because you didn’t do anything to cause them—only Apple can fix them. So, although I can’t offer solutions to every problem, I’ve compiled solutions to some of the most common (and serious) problems in the pages ahead, including difficulties receiving and sending mail, problems with damaged mailboxes, and misbehaving Spotlight searches.
Although some of this information may provide useful background for resolving issues in Mail in iOS/iPadOS too, the specifics are different; see Troubleshoot iOS & iPadOS Mail Problems for help with Mail in iOS and iPadOS.
Fix Incoming Mail ...
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