Quote Originally Posted by SteveinMN View Post
It is incredibly easy to forge someone's email address as a "From" address. And (too) many people are careless about the quality and proliferation of their email passwords. So I would not be too quick to blame the dentist for the spam. But good on you for not opening it.

It is also too common, that someone uses the same password across sites (including email password). With that, one can have their email used as a spambot.