Sender authentication involves setting up multiple records in your domain's DNS settings:
SPF (Sender Policy Framework): This specifies which mail servers are allowed to send emails on behalf of your domain. Set it up by adding a TXT record in your DNS settings. DKIM (DomainKeys Identified Mail): This adds a digital signature to your emails, ensuring the content has not been altered. Add a DKIM record to your DNS settings. DMARC (Domain-based Message Authentication, Reporting & Conformance): This policy helps you monitor and manage email authentication, providing reports on mail sent from your domain. Add a DMARC record to your DNS.