Authentication protocols

An authentication protocol is a cryptographic standard that validates the sender and receiver. It acts as an ID card to verify a brand’s identity to both email servers and inbox service providers (ISPs), ensuring the brand is credible.

Brands use different types of authentication protocols like SPF, DKIM, and DMARC to protect their emails against malicious attacks. ISPs use these protocols to determine the authenticity of brands’ emails. If a brand doesn’t have the proper records in place, ISPs might view emails as spam, resulting in ISPs restricting the brand’s emails, ultimately impacting deliverability.