Warning: With the following settings, Mail Buster will return "Accepted" to the sending server even if in fact the message was classified as spam and rejected. Since this technically breaks with the SMTP RFC specifications, we don’t recommend enabling it.
1. Log into Mail Buster control panel: https://my.nospamcloud.com
2. Open "Filter settings" in the left hand side menu.
3. Choose "Accepted" under "Quarantine response".
4. Press "Save".