Yet another email validation mechanism

Model.cs

public class Model : IValidatableObject
{
	[Display(Name = "Send to (email)")]
	[Required(ErrorMessage = "'{0}' must be supplied")]
	[RegularExpression(@".+\@.", ErrorMessage = "{0}' must be an email address")]
	public override string ToEmailAddress { get; set; }

	public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
	{
		ValidationResult emailInvalidError = null;
		try
		{
		    var email = new System.Net.Mail.MailAddress(ToEmailAddress);
		    Debug.WriteLine("Email validated with host '{0}'", email.Host);
		}
		catch (FormatException)
		{
		    emailInvalidError = new ValidationResult("'Send to' must be a valid email address", new[] { "ToEmailAddress" });
		}
		if (emailInvalidError != null)
		{
		    yield return emailInvalidError;
		}
	}
}