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Lost in all the technical jargon? Find definitions for common email and technical terms and learn more with our related resources.


DKIM, which stands for Domain Keys Identified Mail, is an email authentication protocol that allows a mail server to check that an email message was sent and authorized by the sending domain. It acts as an identity card for email sending to reassure mail servers that the sender is authentic and credible.


Domain-based Message Authentication, Reporting, and Conformance (DMARC) is an authentication method designed to stop bad actors from impersonating you. DMARC acts as an “identity card” to mail servers and inbox service providers (ISPs), allowing both to validate the sender’s identity to prevent cybercriminals from spoofing emails.

DMARC reporting

Domain-based Message Authentication, Reporting, and Conformance (DMARC) reporting is the process of sending information and metrics about emails sent from a domain – whether the emails are authenticated by SPF and DKIM or not. These reports also inform brands if any spammers are using their domain names to send malicious emails to recipients.

DNS TXT record

A Domain Name Service (DNS) TXT record is an authentication protocol used to verify domain ownership to other sources outside your domain, like inbox service providers (ISPs), mail exchange servers, and email clients. A DNS record is a *.txt file that verifies domain ownership.

Distribution channel

A distribution channel is a network of wholesalers, retailers, and buyers that brands rely on to manufacture products and deliver and market them in end markets. Here are the three types of distribution channels:


Domains are destinations on the internet that are controlled by individuals or organizations. Searchers look for domain names by entering the address or a keyword in a browser’s search bar. For instance, Mailgun’s domain name is Companies send emails from their domains. A domain’s reputation strongly impacts whether or not a brand’s email messages will be placed in its recipient’s inbox, which is also known as inboxing rate.

Double opt-in

Double opt-in is the process of adding new subscribers to an email list by reconfirming a recipient’s consent to receive emails. Here’s a step-by-step process: