An email address identifies an email box to which email messages are delivered.

A wide variety of formats were used in early email systems, but only a single format is used today, following the standards developed for Internet mail systems since the 1980s.

Otherwise, you are allowing attackers to repeatedly attack your application until they find a vulnerability that you haven't protected against.

Detecting attempts to find these weaknesses is a critical protection mechanism.

This article uses the term email address to refer to the addr-spec defined in RFC 5322, not to the address that is commonly used; the difference is that an address may contain a display name, a comment, or both. [email protected] made up of a local-part, an @ symbol, then a case-insensitive domain.

Although the standard specifies the local part to be case-sensitive, in practice the mail system at may treat John.

Your suggestion about having a validation rule would be a very bad idea.

Did you know, the world's most common last name is 王?With approach 2 (block invalid characters), the user might type something quickly and end up with a result which looks nothing like what they wanted.Let's say a user-name field should only contain standard unaccented characters. This is bad: the user would have to work out what had been omitted and why and then correct it. Method 1 (validation message) is therefore to be preferred — and this should be inline during entry rather than returned after the form is submitted.Balakrishnan Prabhu is the founder of Corpocrat magazine.He is also the founder of Best Citizenships (BC), assisting wealthy individuals with with global citizenship and residency programs in Europe.I went through the documentation of the plugin and there was no such methods to strip the special characters in the plugin.