Challenge Response Spam Filters Explained
spam. Spammers email millions of people each day. This is an automated process that they can’t possibly monitor manually. Enter challenge response spam email filtering.
When using a challenge response system each email address must be authorized to deliver email to you. You can either authorize these email addresses manually by adding them to your challenge response whitelist or the challenge response email server can take care of that for you.
The process is simple but incredibly efficient.
Spammer sends email
Challenge response email server doesn’t recognize address so issues a challenge email that must be phyiscally answered by a real human.
Challenge answer = yes = sender is authorized to send you email
Challenge answer = no = senders email address is added to blacklist and all future email from them is automatically blocked.
Challenge repsonse spam filters demand that a real person reply to the challenge email. Spammers who generate millions of emails a day
