How about you display a breakdown of the spam scores instead of showing the total?
The way it currently is, there is no way of knowing why exactly that mail made it to the spam.
Also it’ld be nice to be able to embed them within the mail headers as well.
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Another one that comes into mind is regarding training. As well as accepting training mails from an email address, can’t you make it sync with an external account and learn ham/spam from within that email?
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Also, can you add Comodo Free SSL and Let’s Encrypt support?
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How about a test interface where one can upload a simple mail and see how Korumail processes them?
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Lastly, having the ability to change 8443 port to something else would be a nice addition.