FEAT: Block remote tracking pixels in HTML email

[andrinoff]

Is your feature request related to a problem?

Remote images can act as tracking pixels, leaking read status.

Describe the solution you'd like

Block remote image loading by default with a per-message 'load remote content' opt-in.

Describe alternatives you've considered

Loading all remote content.

Additional context

See view/html.go and internal/htmlsanitizer.

[floatpanebot]

Thanks for the suggestion!

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