Common technical terms in email

Stay current and expand your email knowledge with our list of common technical terms.


A postmaster is a mail server’s administrator and has the associated email address Mail servers route messages about errors in email sending or processing to this email address. Every domain that supports the Simple Mail Transfer Protocol (SMTP) for sending emails must have a postmaster address setup.

An example of a postmaster email is a “postmaster email delivery failure” message. This usually occurs when the outgoing mail server can’t relay an email to recipients. Google capitalizes on the idea of a postmaster role with its Google Postmaster tools, which enable brands to fine-tune control over sending and deliverability.