Mail encryption

I notice that, at the top of my inbox for gmail, it says “Not Encrypted”.
It does not say that at my GMX mail inbox.
I would be grateful for an explanation and how to correct if there is something I need to do. My O/S is Windows 10.

You have sorted your Gmail Inbox by Encrypted.

If you don’t want that, click on the column row header where it says Sorted by Encrypted, and change that back to Received.

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Thanks Gary. I have done as you suggested to clear the “Not Encrypted” heading.