* Minor format change to match style of rest of project.

* Makes check for `@sparpostbox.com` case insensitive

Author: Chris Wilson

libs/sparkpost-lib/src/main/java/com/sparkpost/Client.java

@@ -6,9 +6,9 @@
 
 import com.sparkpost.exception.SparkPostException;
 import com.sparkpost.model.AddressAttributes;
+import com.sparkpost.model.OptionsAttributes;
 import com.sparkpost.model.RecipientAttributes;
 import com.sparkpost.model.TemplateContentAttributes;
-import com.sparkpost.model.OptionsAttributes;
 import com.sparkpost.model.TransmissionWithRecipientArray;
 import com.sparkpost.model.responses.Response;
 import com.sparkpost.resources.ResourceTransmissions;
@@ -112,10 +112,10 @@ public Response sendMessage(String from, List<String> recipients, String subject
         contentAttributes.setText(text);
         transmission.setContentAttributes(contentAttributes);
 
-        if (from.contains("@sparkpostbox.com")) {
-          OptionsAttributes options = new OptionsAttributes();
-          options.setSandbox(true);
-          transmission.setOptions(options);
+        if (from.toLowerCase().contains("@sparkpostbox.com")) {
+            OptionsAttributes options = new OptionsAttributes();
+            options.setSandbox(true);
+            transmission.setOptions(options);
         }
 
         RestConnection connection = new RestConnection(this);