Valid email address format

A valid email address consists of an email prefix and an email domain, both in acceptable formats.

The prefix appears to the left of the @ symbol.

The domain appears to the right of the @ symbol.

For example, in the address, "example" is the email prefix, and "" is the email domain.

Acceptable email prefix formats

  • Allowed characters: letters (a-z), numbers, underscores, periods, and dashes.
  • An underscore, period, or dash must be followed by one or more letter or number.
Invalid email prefixes: Valid email prefixes:

Acceptable email domain formats

  • Allowed characters: letters, numbers, dashes.
  • The last portion of the domain must be at least two characters, for example: .com, .org, .cc
Invalid email domains: Valid email domains: