Inheritance update

src/Postal/Email.cs

@@ -9,7 +9,7 @@ namespace Postal
 {
     /// <summary>
     /// An Email object has the name of the MVC view to render and a view data dictionary
-    /// to store the data to render. It is best used as a dynamic object, just like the 
+    /// to store the data to render. It is best used as a dynamic object, just like the
     /// ViewBag property of a Controller. Any dynamic property access is mapped to the
     /// view data dictionary.
     /// </summary>
@@ -55,7 +55,10 @@ protected Email()
         /// </summary>
         public List<Attachment> Attachments { get; set; }
 
-        internal ImageEmbedder ImageEmbedder { get; private set; }
+        /// <summary>
+        /// The <see cref="ImageEmbedder"/> that generates the <see cref="LinkedResource"/> objects for the email.
+        /// </summary>
+        protected internal ImageEmbedder ImageEmbedder { get; private set; }
 
         /// <summary>
         /// Adds an attachment to the email.
@@ -67,15 +70,15 @@ public void Attach(Attachment attachment)
         }
 
         /// <summary>
-        /// Convenience method that sends this email via a default EmailService. 
+        /// Convenience method that sends this email via a default EmailService.
         /// </summary>
         public void Send()
         {
             CreateEmailService().Send(this);
         }
 
         /// <summary>
-        /// Convenience method that sends this email asynchronously via a default EmailService. 
+        /// Convenience method that sends this email asynchronously via a default EmailService.
         /// </summary>
         public Task SendAsync()
         {

src/Postal/EmailParser.cs

@@ -30,7 +30,7 @@ public EmailParser(IEmailViewRenderer alternativeViewRenderer)
         /// <param name="emailViewOutput">The email view output.</param>
         /// <param name="email">The <see cref="Email"/> used to generate the output.</param>
         /// <returns>A <see cref="MailMessage"/> containing the email headers and content.</returns>
-        public MailMessage Parse(string emailViewOutput, Email email)
+        public virtual MailMessage Parse(string emailViewOutput, Email email)
         {
             var message = new MailMessage();
             InitializeMailMessage(message, emailViewOutput, email);
@@ -132,7 +132,7 @@ void ProcessHeader(string key, string value, MailMessage message, Email email)
         IEnumerable<AlternateView> CreateAlternativeViews(string deliminatedViewNames, Email email)
         {
             var viewNames = deliminatedViewNames.Split(new[] { ',', ' ', ';' }, StringSplitOptions.RemoveEmptyEntries);
-            return from viewName in viewNames 
+            return from viewName in viewNames
                    select CreateAlternativeView(email, viewName);
         }
 

src/Postal/EmailViewRenderer.cs

@@ -35,7 +35,7 @@ public EmailViewRenderer(ViewEngineCollection viewEngines)
         /// <param name="email">The email to render.</param>
         /// <param name="viewName">Optional email view name override. If null then the email's ViewName property is used instead.</param>
         /// <returns>The rendered email view output.</returns>
-        public string Render(Email email, string viewName = null)
+        public virtual string Render(Email email, string viewName = null)
         {
             viewName = viewName ?? email.ViewName;
             var controllerContext = CreateControllerContext();