It will not keep NBox off blacklists. I've been using sneakemail for this for like fifteen years (and they do not offer a free service), and I've run into a num

It will not keep NBox off blacklists. I've been using sneakemail for this for like fifteen years (and they do not offer a free service), and I've run into a number of sites that ban their domains anyway. Adafruit, for example, bans their domains.