There were a bunch of reports recently of ENOTEMPTY errors when trying to install node-red-node-email.
For example https://discourse.nodered.org/t/enotempty-when-installing-node-from-palette-since-nodered-3-0-directory-not-empty/65968
(And it happened to me yesterday too, deleting the named directory fixed it)
I don't think it's the same issue as DynamicDave's.
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