ConfigServer MailScanner by default enables maximum 30 entries per cPanel account in their Whitelist and Blacklist. To increase this setting, go to WHM » Plugins » ConfigServer MailScanner Front-End » Front-End Settings » End User Settings and under Maximum entries per account in their blacklist set new limits.
![Change number of cPanel MailScanner Spam Blacklist entries mailscanner - Change number of cPanel MailScanner Spam Blacklist entries](https://i0.wp.com/pcx3.com/wp-content/uploads/2021/08/mailscanner.gif?resize=736%2C477&ssl=1)
After increasing this value users can now add whitelist & blacklist entries as per new limits.