As an end user, what can I do to help reducing tracking in e-mails? Politely sending and email to Company Foo? What are good arguments to write in there, so th

As an end user, what can I do to help reducing tracking in e-mails? Politely sending and email to Company Foo? What are good arguments to write in there, so that _anyone_ working in Company Foo can understand the problem? I don't expect companies to start using plain text in emails, although I'd love that...