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Actually, the designated "spam" folder does have an "(empty)" link just like the Trash folder. This was implemented a while ago.
In addition, any folder that is used with a filter can not be deleted but trying to delete it will empty the folder. This isn't really a feature but a side-effect. If you select the folder and click the folder "Delete" button you will get a warning about deleting the folder and all it's contents. If you continue, all the messages in the folder will be deleted but the folder will remain. You will see an error message indicating that the folder could not be deleted because it is used by a filter.
And yes, unfortunately, the only way to train the DSPAM trainable spam filter is from the Runbox Mail Manager (RMM) web interface.
Regards,
Rich
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