Receiving emails from an untraceable sender

I thought I'd also share the following with you, concerning strange emails that I have received as I didn't know what else to add as a first post.

Earlier last year, one day I checked on my emails. Nothing out of the ordinary there, I know. But wait, there's more. As I began checking my emails I came across an email I had received that had no sender's details attached to it. The sender's email address was completely missing. The content of the email was also completely blank, making it a strange email. A few days later I received 4 other identical emails from this unknown person who had a non-existent email address. By this time I was totally annoyed simply by receiving these emails. Who the f*** was sending me these emails. I decided to reply to one of the emails but in my attempt to send it, my email provider declared it could not be sent because there was no email address provided to reply to it and in fact the location of the email address could not be located. This baffled me.

I began asking myself questions, which to this day I still cannot answer. I asked myself, for example, How is it possible to send an email to someone without using an email address or a location to send it from? How is it even possible to even send such an email in the first place?

Over a total of 8 days I received something like 16 of these blank emails with no sender email address attached. I confided in my brother to help solve this mystery, but all he could tell me was it was possible that the emails were being sent by extraterrestrials from a remote location and had the technology to bypass the need for using an email address to send emails to me. He also insisted that the emails were not blank, that despite them being empty, there was indeed hidden content in them. I just needed to focus on the blank content in order to receive the content of them.

I ignored his theory and just deleted the emails instead. Once I began deleting the emails, I stopped receiving more of them. WTF? Was someone watching me, or anticipanting my every move? If so, who? I still don't know, and probably never will.