Its probably worth mentioning that some of those (like the sun cross) are also used as neo-nazi insignia. I am completely in favour of still using them (we shouldn’t let nazis spoil century old symbols), but I felt it was important to note.

If privacy is your concern, then I’d use two different mail addresses / domains. One with your “professional” TLD (mail@johndoe.com) and one wirh your privacy focussed TLD (mail@anon.com).