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DomainKeys Identified Mail is an email authentication method designed to detect forged sender addresses in email, a technique often used in phishing and email spam.

Sender Policy Framework is an email authentication method which ensures the sending mail server is authorized to originate mail from the email sender's domain.

TXT is an abbreviation for text. It lets sources outside of your domain know what text information you have. The text can be human or machine-readable and used for various purposes. It permits the domain administrator to add text to the DNS zone.

Email spam, also referred to as junk email, spam mail, or simply spam, is unsolicited messages sent in bulk by email.

A spam score is a numeric value assigned to an email by an external system before it is delivered to identify whether it is spam or not. The score is based on the subject line, body text, links included in the email, and any coding in the email.

A DMARC record stores a domain's DMARC policy. DMARC records are stored in the Domain Name System (DNS) as DNS TXT records. A DNS TXT record can contain almost any text a domain administrator wants to associate with their domain.

IP reputation is a measure of the trustworthiness of an IP address based on its past behavior. IP reputation is important because it is used by email filters, firewalls, and other security tools to identify and block potentially malicious traffic.

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