to configure your email , you first need to click on the “Email Accounts” link then click on “Access Webmail”:
Setting Up a Default Address
Click on “Default Address” on the “EMAIL” section in cPanel:
cPanel SPF and DKIM Records
SPF record setting (acronym for Sender Policy Framework) is an effective and simple method which lets your domain name has the correct SPF record, and
DKIM (DomainKeys Identified Mail) is a way to e-mail authentication. This method uses information about domain which allows receiving server to verify if the e-mail message was sent by legal owner of that domain name.
when there is no SPF/DKIM configured for your domain , which cause cases are called mail spaming.