Sender verification typically involves several steps and protocols:
SPF (Sender Policy Framework): This protocol allows the owner of a domain to specify which mail servers they use to send emails. It helps in preventing email spoofing by verifying the sender's IP address. DKIM (DomainKeys Identified Mail): DKIM adds a digital signature to your email headers. This signature is verified by the recipient's mail server to ensure the email hasn't been altered in transit. DMARC (Domain-based Message Authentication, Reporting & Conformance): This protocol builds on SPF and DKIM, providing a way for email domain owners to protect their domain from unauthorized use.