Be careful. You probably should burn your mail. You know that you might have an SSPX adherent as your mailman.
It'd be a shame to lose all that mail labeled "resident" though.
If my mailman were so benighted as to succumb to whatever seductions the SSPX schism may have to offer in lieu of Roman Catholicism, I will try to remember to include him/her at Mass. Actually, I am well acquainted with the actually Protestant postmaster in my town and we get our mail at the post office. I know of no one in my georgraphical vicinity who is such a howling moonbat as to be defending dead Marcel and SSPX on the internet.