Because a lot of spam mails now are coming from many countries, it is harder to fight them. Thus, email providers have added feature that conveniently pile unknown senders to the “bulk mail”.
Many email services now have “bulk-mail” baskets.How do they do this? The concept is simple. If you know someone, they can send you emails. If you don’t know them, put them in the bulk email pile and then “choose” to allow them into your circle. Spam Blocking software has this concept as well, but having extra layers seems critical these days, so it is worth looking into.If the email service that you are using currently does not support this then maybe it’s time to change.