To prevent unauthorized emails from being sent from your domain, you can use several email authentication protocols:
1. SPF (Sender Policy Framework): Specifies which mail servers are allowed to send emails on behalf of your domain. 2. DKIM (DomainKeys Identified Mail): Adds a digital signature to your emails to verify that they are sent from your domain. 3. DMARC (Domain-based Message Authentication, Reporting & Conformance): Uses SPF and DKIM to ensure that your emails are protected and provides reporting capabilities.