I would encourage you to study peaceful revolutions (e.g. Mahatma Gandhi). Protestors protested against unjust laws by filling up the prisons. One can't be afraid to lose money or time when taking a moral stance. You are ofcourse doing this at great personal expense because you believe you are correct, not for external praise or glory.

Back up a moment, this is suggesting emailing a zip bomb[to yourself or an account you know will not open it.] I believe showing intent is a separate issue.

I mean, the above said valid, not legal. I've seen the word valid used more often to mean ethical than legal, so I think it's still accurate.