E-mail Address requirements

The following are the requirements for an e-mail address:

  • An e-mail address consists of local part and domain separated by an at sign (@) character.
  • The local part may consist of alphabetic and numeric characters, and the following characters: !, #, $, %, &, ‘, *, +, -, /, =, ?, ^, _, `, {, |, } and ~, possibly with dot separators (.), inside, but not at the start, end or next to another dot separator.
  • The local part may consist of a quoted string—that is, anything within quotes (“), including spaces.
  • Quoted pairs (such as \@) are valid components of a local part.
  • The maximum length of a local part is 64 characters.
  • A domain consists of labels separated by dot separators.
  • Domain labels start with an alphabetic character followed by zero or more alphabetic characters, numeric characters or the hyphen (-), ending with an alphabetic or numeric character.
  • The maximum length of a label is 63 characters.
  • The maximum length of a domain is 255 characters.
  • The domain must be fully qualified and resolvable to a type A or type MX DNS address record.

Image Credits: Photo by Isis França on Unsplash.

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