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  5. Email format validation
  6. Email address syntax
  7. Domain

Domain

The domain of an email address can contain any of the following ASCII characters:
  • Uppercase and lowercase Latin letters A to Z and a to z
  • Digits 0 to 9
The following guidelines apply to the domain of a valid email address:
  • The domain must match the requirements for a hostname, and include a list of dot (.) separated DNS labels.
  • The dot (.) character is allowed but cannot be the first or last character and cannot appear consecutively.
  • No digits are allowed in the top-level domain (TLD). The TLD is the portion of the domain after the dot (.).
  • The TLD must contain a minimum of 2 and a maximum of 15 characters.
  • Spaces are not allowed.
  • The length is not validated.