|Document ID: ||4621|
|Subject: ||Email Challenge Response|
|Creation date: ||12/14/15 4:35 PM|
|Last modified on: ||8/15/18 2:33 PM|
Challenge/Response filtering, also known as auto-white-listing,
or permission based email is increasingly popular and controversial mechanism to prevent spam.
Though it can be extremely effective, it has drawbacks.
Consider the following scenario
that explains this mechanism.
- Bob sends an email
message to Mary
- Mary's email server accepts the message but before transferring it to her Inbox, the server sends a message back to Bob, confirming if he actually sent a message. Bob must reply to this automatically generated message which confirms his original message.
- Since spammers almost always either forge the sender or send from invalid address. Therefore, Mary will never get the message is someone else pretends to be Bob.
Enabling Challenge/Response in Xeams
Follow the steps below to enable Challenge/Response in Xeams.
- Log in to Admin Console
- Click Server Configuration
- Select the Challenge Response tab
- Check Enable Challenge Response, specify an email for processing and a threshold value. Check the help in Admin Console for the exact description of each field.
- Click the Save button
Disadvantages of using Challenge/Response
- It is considered rude by many users
- It is not a viable option if you receive emails from unknown individuals, such as potential clients
- Slows down email delivery
- Will never work if both parties use a Challenge/Response system
Customizing Challenge Email
The template for the email message sent during challenge/response comes from
. Modify the contents of this file to
change the text for this email.
Posted by Bob on 5/4/21 11:52 AM
If Mary emails me first her platform had better whitelist me or I will write a rule to reject her CRS
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