There are several methods for verifying the sender in email marketing:
SPF (Sender Policy Framework): This verifies that the email comes from an authorized server. DKIM (DomainKeys Identified Mail): This adds a digital signature to your emails, confirming that the content has not been altered. DMARC (Domain-based Message Authentication, Reporting, and Conformance): This policy helps prevent email spoofing by aligning SPF and DKIM.