If you need a WordPress plugin that integrates with cPanel email accounts, you should try the WordPress cPanel E-Mail Manager plugin.
The WordPress cPanel E-Mail Manager plugin allows WordPress site administrators to create and remove cPanel e-mail accounts within the WordPress interface. The email accounts can also be linked to existing WordPress users of the site.
Once installed, navigate to "Users" > "eMail Manager", connect to your site cPanel account, set & save the configuration options. Thereafter, click on "Add New Account" to create the new email accounts.
If you upgrade, you will enjoy some pro features.