Thank you for sharing this, Lynette.

It's disturbing when a tech support person says to delete everything and start over.. red flags all over the place.... Does it mean it's unfixable, or simply that one person doesn't know the fix. I'd call back two or three times to see if a different tech has a different opinion.

Does it toggle to remove -then- return all the "read emails"?   Or is there a way to turn that feature off for the future? 

I'm glad you discovered a way to stop the deletions. I hope the others can be recovered.

Linda M. Feltner Artist LLC
P.O. Box 325, Hereford, AZ 85615
On 9/12/18 7:52 PM, Lynette Cook wrote:
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I’ve had a recent issue of e-mail in my Apple Mail program disappearing (Sierra). By chance I discovered why it did that. I had been so grieved - and Apple’s Tech Support was steering me toward deleting all my mail accounts and setting them all up again (horrors!) - that I want to share it with you in case it will keep anyone else from the same anxiety.

It’s all about Command-L. When you use this command repeatedly it toggles on and off a filter of some kind (that Apple apparently built into the application, as I didn’t set it up) and it makes all the read mail in the mailbox disappear. Unread mail remains. Thankfully I figured this out before said account deletions occurred. :) Doesn’t seem to happen in the “main” mailbox. But I have in-boxes and “Sent” boxes for different e-mail accounts and it occurs in all those. 


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