mvc [DataType(DataType.EmailAddress) no validation

You could use the usual DataAnnotations library by just using [EmailAddress]

using System.ComponentModel.DataAnnotations;
    [Required]
    [EmailAddress]
    public String Email { get; set; }

Also just for reference, here's the regular expression version of this validation:

    [RegularExpression(@"^[A-Za-z0-9](([_\.\-]?[a-zA-Z0-9]+)*)@([A-Za-z0-9]+)(([\.\-‌​]?[a-zA-Z0-9]+)*)\.([A-Za-z]{2,})$", ErrorMessage = "Email is not valid")]
    public String Email {get; set;}

Best of luck!

At the moment I have solved my problem using DataAnnotationsExtensions

it just works, you add their library with NuGet

using DataAnnotationsExtensions;


[Required]
    [DataType(DataType.EmailAddress)]
    [Email]
    public string Email { get; set; }

It looks like all the answers focus on the Data Model while this issue can be affected by the View itself.

The following on MVC .NET 4.5 is working alright:

Data model:

[Required]
[DataType(DataType.EmailAddress)]
[DisplayName("Email")]
public string Email { get; set; }

Razor View:

@Html.LabelFor(model => model.Email)
@Html.EditorFor(model => model.Email)

Note: do not need to add [EmailAddress] attribute. If you use [DataType(DataType.EmailAddress)] along with @Html.EditorFor() in your View, you should be fine.

As highlighted with rich.okelly, at the end you want your input rendered as <input type="email" />.