textbox未接受给定的完整字符串

我正试图在文本框中输入电子邮件地址，例如。dd@gmail.com，但只需要dd@g.

这是html:

<input type="email" class="form-control ng-pristine ng-valid-email ng-invalid ng-invalid-required ng-touched" name="email" placeholder="Email" ng-model="Email" required="">

C#代码

  var Email = driver.FindElement(By.Name("email"));
  Email.SendKeys("dd@gmail.com");

for (int i = 0; i < myString.length(); i++) {
    element.sendKeys(myString.substring(i, i + 1));
}