The Email Domain Guard consists of multiple checkers and a risk scoring feature. Each of the checkers analyzes a specific aspect of the given email address, the assessment via the checkers is then combined in terms of a multifactor analysis to a risk score. Available checkers:

• Email Component Extractor: Accurately separates an email address into its local part and domain, and then attempt to derive the base domain from it.
• Email Format Checker: Validates the structure and syntax of email addresses to ensure they follow standard conventions.
• Domain Existence Checker: Verifies the existence and accessibility of domain names, ensuring communications are directed to functional domains.
• Disposable Mail Checker: Detects disposable or temporary email addresses, ensuring the quality and authenticity of user-provided email addresses.
• Freemail Checker: Identifies freemail addresses, helping to assess the quality and legitimacy of user-provided email addresses.
• Role Category Checker: Identifies role-based email addresses, enhancing personalization and optimizing resource allocation.
• Whois Checker: Retrieves and analyzes whois information for domains, providing valuable details such as registration date and domain age.
• DNSBL Checker: Checks if email domain IP addresses are listed on DNS-based Blackhole Lists (DNSBLs), identifying potential sources of spam or malicious activity.
• Data Breach Checker: Analyzes email accounts and domains for potential data breaches using the “Have I Been Pwned” API.
• Shared Email Checker: Identifies shared email addresses among community members while ensuring privacy through anonymous data sharing and secure hashing.
• Fraud Case Checker: Identifies email addresses involved in any reported and confirmed fraud cases via CDQ's Fraud Guard.