Add 'from' support to MessageCreateOptions

src/main/java/com/mailosaur/models/MessageCreateOptions.java

@@ -14,6 +14,13 @@ public class MessageCreateOptions {
 	@Key
     private String to;
 
+    /**
+     * Allows for the partial override of the message's 'from' address. This **must** be
+     * an address ending with `YOUR_SERVER.mailosaur.net`, such as `[email protected]`.
+     */
+	@Key
+    private String from;
+
     /**
      * If true, email will be sent upon creation.
      */
@@ -55,6 +62,18 @@ public MessageCreateOptions withTo(String to) {
         return this;
     }
 
+    /**
+     * Partially overrides of the message's 'from' address. This **must** be an address ending 
+     * with `YOUR_SERVER.mailosaur.net`, such as `[email protected]`.
+     *
+     * @param from The email address.
+     * @return the MessageCreateOptions object itself.
+     */
+    public MessageCreateOptions withFrom(String from) {
+        this.from = from;
+        return this;
+    }
+
     /**
      * Sets whether the email should be sent upon creation.
      *