This article will show you how to set up SPF, DKIM and DMARC records within your Virtual Private Server.
If you send emails using a custom domain name, you may need to include the following records on your associated domain: Sender Policy Framework (SPF), Domain Keys Identified Mail (DKIM) and Domain-based Message Authentication, Reporting and Conformance (DMARC).
To add an SPF (Sender Policy Framework) record, simply add a TXT record that includes the following:
v=spf1 include:secureserver.net -all
If your VPS uses cPanel, please check the following page for details on how to add a DKIM record: Email Deliverability in cPanel
If your VPS uses Plesk, please check the following page for details on how to add all 3 records: DKIM, SPF, and DMARC Protection