Email is where the battle against spam began. Fortunately, email providers have become very smart about filtering out junk mail, so your inbox only shows the stuff you actually want. Have you ever wondered how your email app decides what goes in Spam ? It uses a mix of filters and rules behind the scenes:
Content filters analyze the content
Sender check checks where the email is coming from. If the sender address or mail server has a bad reputation (for example, it has already been phone number list used for bulk spam), the email is blocked or sent to the junk folder.
Authentication also plays
These smart filters use algorithms (and a did you know that an little bit of machine learning ) trained on millions of emails. Over time, they learn to recognize what people call “spam” or “not spam.” That’s why if you keep flagging those pesky promotional emails, your fax list inbox becomes even better at hiding similar messages and blocks spam by default.