In previous versions of Mail on macOS, there was an entry in Settings that read "Load remote content in messages".
I'd like to disable loading remote content. Is that possible to do in Catalina, either via the GUI or via the command line?
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Load remote content in messages
When remote content is retrieved from a server, information about your Mac can be revealed. You can deselect the option for increased security, but some messages may not display correctly.
Remote content isn’t displayed in messages that Mail marks as junk.
This is found in
... the Mail app on your Mac, choose Mail > Preferences, then click Viewing.