It always boggles my mind that people do things like this. I have no idea how they got into my email. FastMail ID'd it as spam, but I was curious about it so I looked at it to see if it was actually from FamtMail. It just didn't feel like something FastMail would send out. I've already sent it to the abuse address with a short note.
Have you ever received one of these emails? I don't know what I did wrong to invite them into my life...