Skip to main content
001.006

Email Address Structure and Standards

An address is a precise set of coordinates. We'll break down the (the user) from the (the host) and explain the "magic" of plus addressing (e.g., ) for easy, automatic filtering.

8 questions in this topic

Questions about Email Address Structure and Standards

What is the syntax of an email address (local-part@domain)? What characters are allowed in an email address? What is plus-addressing and tagging? What is a sub-address? What is case sensitivity in local parts? What are invalid addresses? What is domain literal addressing? How do catch-all addresses work?