Definition
Authentication stops spoofing and builds trust. Modern senders must implement all three core standards.
Best Practices
- Implement SPF, DKIM and DMARC together.
- Use BIMI for brand visibility once authenticated.
- Monitor Authentication-Results and reports.
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Related Glossary Terms
Apple App Password (Email)
An Apple app password is a generated, app-specific password used to sign into an email account through clients that do not support two-factor authentication.
Email Authentication Protocols
Email authentication protocols are technical standards that verify the identity of an email sender, helping mailbox providers distinguish legitimate mail from spam and phishing.
BIMI
BIMI (Brand Indicators for Message Identification) is an email standard that allows brands to display their logo next to their emails in supported email clients. It requires DMARC enforcement at quarantine or reject policy.
DKIM (DomainKeys Identified Mail)
DKIM (DomainKeys Identified Mail) is an email authentication method that uses digital signatures to verify that an email was not tampered with during transit and comes from a authorised domain.
DMARC Alignment
DMARC identifier alignment determines whether the domain in the From header matches the domains used in SPF and DKIM authentication. Strict or relaxed.
DMARC Policy Tags
DMARC DNS record tags including v, p, sp, rua, ruf, pct, adkim, aspf, fo, rf, and ri control authentication policy, reporting, and alignment enforcement.
Frequently Asked Questions
SPF, DKIM and DMARC primarily, with BIMI and ARC added.
To prove legitimacy and improve deliverability.
SPF, DKIM and a DMARC policy.