diff --git a/lib/mandrill-transport.js b/lib/mandrill-transport.js
index e058e1c..7c06da7 100644
--- a/lib/mandrill-transport.js
+++ b/lib/mandrill-transport.js
@@ -53,7 +53,10 @@ MandrillTransport.prototype.send = function(mail, callback) {
       subject: data.subject,
       headers: data.headers,
       text: data.text,
-      html: data.html
+      html: data.html,
+      global_merge_vars: data.global_merge_vars ? data.global_merge_vars : [],
+      merge_vars: data.merge_vars ? data.merge_vars : [],
+      google_analytics_domains: data.google_analytics_domains ? data.google_analytics_domains : []
     }
   }, mandrillOptions);