Activating the Apple Mail Plug-In on Big Sur

SpamSieve
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1

The Big Sur installation of SpamSieve mail bundle Plug-in still failed to activate.

2

Which versions of macOS and SpamSieve are you using?

3

I’m using latest release ( 11.6.1). .

4

Please describe what you mean by “failed to activate” (i.e. what you did and what happened). Also, which version of SpamSieve are you using?