There was a Linux client I saw a while ago—Spring Mail or something like that?—which first downloaded your email from your provider onto their own servers, then your local client got them from their server. This additional cloud step is what I want to avoid.
What do you mean by uploading to the cloud first? Any email goes over the internet
They mean mail apps that keep a copy of your emails in their servers
Are you saying that Mozilla keeps copies of your emails on their own servers?
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There was a Linux client I saw a while ago—Spring Mail or something like that?—which first downloaded your email from your provider onto their own servers, then your local client got them from their server. This additional cloud step is what I want to avoid.