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.
No, I am saying that OP is looking for an alternative client, which also doesn’t upload their emails. For example, mailspring would be a bad recommendation because, as far as I know, it uploads your email to their server
What do you mean by uploading to the cloud first? Any email goes over the internet
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.
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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No, I am saying that OP is looking for an alternative client, which also doesn’t upload their emails. For example, mailspring would be a bad recommendation because, as far as I know, it uploads your email to their server
Can you show any evidence that suggests that either Firefox or Mailspring keeps copies of your emails?