Ga?l Lalire via Postfix-users: > To do so smtp server should manage a list of email which are human. > - First you will populate this list with your address book and then > each time you send a mail it will add each ` to addresses ' to > this human list. > - If you receive a mail where ` from address ' is in the human list, it will > be accepted. > - If you receive a mail where ` from address ' is not in the human > list, it will be put in hold and send a response email asking to > prove that you are human (recaptcha ?).
The idea has its own Wikipedia web page. I suggest that you read it. https://en.wikipedia.org/wiki/Challenge%E2%80%93response_spam_filtering Wietse _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
