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RFC 2822, that specifies what is and is not allowed in an email address, states that the form of an email address must be of the form "local-part @ domain".
The "local-part" of an email address must be between 1 and 64 characters in length and may be made up in any one of three ways.
The following are all valid as the first part of an email address: The "domain" portion of the email address can also be made up in different ways.
The most common form is a domain name, which is made up of a number of "labels", each separated by a period and between 1 and 63 characters in length.
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Older email addresses may be made up differently, and may contain a combination of the above.Many email address validators fail to take into account that you do not necessarily need a domain name in an email address - an IP address is fine.The first step to creating a PHP script for validating email addresses is to work out what is and is not valid.There is more about this change in the post Email Address Validation Updated.
Many email address validators will actually throw up errors when faced with a valid, but unusual, email address.Labels may contain letters, digits and hyphens, however must not begin or end with a hyphen (officially, a label must begin with a letter, not a digit, however many domain names have been registered beginning with digits so for the purposes of validation we will assume that digits are allowed at the start of domain names).