- A

challenge/response anti-spam system

works by challenging each unknown email you receive.

- If the sender is legitimate they will respond to the challenge and they will only have to do this once.

-

Challenge/response

systems utilize "whitelists" for your friends and contacts you want to receive email from.

- They also utilize "blacklists" for email addresses or domains that you want to block.

- Since most spam is sent by robot machines they can't respond to the challenge and you never have to see those emails.

- To new friends, who aren't in your whitelist, they simply respond to the challenge and they are added to your whitelist.

- Some excellent challenge/response systems include:

ChoiceMail Free

Zaep

- Here are links to a 3-part editorial series on ChoiceMail

-Email Basic and Spam - Part 1 of 3

How to Fight Spam with ChoiceMail - Part 2 of 3

How to effectively deal with spam in a business environment

- Here is a link to a podcast on ChoiceMail.

Dialogues by Doc - Podcast on ChoiceMail One