Glossary

Domain

Domain

A domain is a human-readable address on the internet (like mailgun.com) that maps to web and email services. In email, your domain appears in the “From” address and is a key signal used by inbox providers to assess reputation and authenticity. Senders use domains to:  

  • Authenticate email via SPF, DKIM, and DMARC  
  • Establish brand identity and trust  
  • Monitor reputation and deliverability  

A domain’s history, configuration, and sending practices all impact inbox placement. Consistent, compliant use of a domain builds trust with mailbox providers, while poor practices can lead to spam filtering or blocking. 

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