#5298: Suppressed input validation on SMPT test form.

This fixes the issue when you try and use address formats such as "User <user@domain.com>" and adds support for sending HTML as part of the message body.

Fixes #5298

src/Orchard.Web/Modules/Orchard.Email/Controllers/EmailAdminController.cs

@@ -23,6 +23,7 @@ namespace Orchard.Email.Controllers {
         public Localizer T { get; set; }
 
         [HttpPost]
+        [ValidateInput(false)]
         public ActionResult TestSettings(TestSmtpSettings testSettings) {
             ILogger logger = null;
             try {