email folder
can you restore or undelete an email folder
MacBook Air 13″, macOS 10.13
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Once the mail folder created in " on my Mac " section is deleted it can be recovered it's permanently erased , however when you right click on mail folder the options appear , once again click on the mail page the pop up window will disappear that way you can undelete mail folder .
See the article Create or delete mailboxes in Mail on Mac - Apple Support