Email – additional information

Character Type: Alphanumeric and special characters

Field Type: Text

Min Field Length: 6 characters

Max Field Length: 256 characters


Email addresses: 



Invalid email addresses:


Additional information:

Email segments. Every email address has three parts.

Domain Name The email domain ( must match the requirements of the host name.

Top Level Domain is a domain name in the Domain Name System that is a direct subdomain of the DNS root zone.  The official list is maintained by the Internet Assigned Numbers Authority (IANA)

Domain Literal or “address literal” uses the destination system’s IP address enclosed by square brackets in the domain part, as an alternative to a domain name.  This is often associated with spam messages.