Reject altered messages from your Subscribers (using DKIM).
DKIM (Domain Keys Identified Mail) is a technology for proving that emails have not been altered in transit.
As a security measure, Mail-List.com reads DKIM headers before releasing messages to your Mailing List. If DKIM fails, the message sender is asked to approve.
This option is "on" by default.
Mail-List.com reads DKIM headers to check if the message changed "in transit".
If it did change, then the DKIM signature fails.
If the DKIM signature check failed, we ask your Subscriber to reply before releasing the message.
If your Subscriber replies and indicates the message is OK, we release the message to your List.
Once your Subscriber replies and confirms their messages are OK to send, we put their email address on the Exception List.
If that Subscriber's email fails DKIM in the future, we do not ask them to approve their messages again. We just release the message to your Mailing List.
Log into your mail-list account at https://database.mail-list.com.
- Click Customize Your List.
- Click Miscellaneous Settings.
- Click Reject Subscriber Messages That Fail DKIM Signing.
- Click No to turn off this security option.
- Click Save.
In this same Menu, you can also choose to enforce SPF settings (Sender Policy Framework). SPF verifies the email was sent from an approved IP address for the domain.
For more information about these email verification options, please see SPF, DKIM, and DMARC.