This article is for cPanel Accounts. Determine where your account is with this guide.
The cPanel interface contains a lot of the DNS record information that can help investigate and troubleshoot any DNS issues on your account:
Email Delivery Route
MX Entry [MX stands for mail exchanger; this record directs e-mail for a domain name]
DNS Zone Editor
You should be able to utilize the Advance DNS editor to make any customizations to your domain(s) that you may need. This includes A, CNAME, or TXT records.