Challenges: Difference between revisions

From ASRG
Jump to navigationJump to search
(New page: {{ast |date=1990s |difficult=Medium |popular=Medium |effective=Medium |where=MTA or MUA |harm=High }} Challenges or Challenge/Response (C/R) attempts to validate unknown senders by replyin...)
(No difference)

Revision as of 09:02, 15 June 2009

Anti-spam technique: Challenges
Date of first use: 1990s
Effectiveness: Medium
Popularity: Medium
Difficulty of implementation: Medium
Where implemented: MTA or MUA
Harm: High

Challenges or Challenge/Response (C/R) attempts to validate unknown senders by replying to their mail with a challenge message. If the sender responds to the challenge in a way the C/R system approves of, the mail is delivered and the sender is whitelisted.

C/R systems are widely considered to be abusive and ineffective. Problems include: