diff --git a/pom.xml b/pom.xml
index 94c0bf0..4ec34a9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
     <groupId>com.storakle</groupId>
     <artifactId>mailgun</artifactId>
-    <version>0.1.14</version>
+    <version>0.1.15</version>
 
     <build>
         <sourceDirectory>src/main/java</sourceDirectory>
diff --git a/src/main/java/com/storakle/mailgun/MailgunApiManager.java b/src/main/java/com/storakle/mailgun/MailgunApiManager.java
index 60723db..21687d1 100644
--- a/src/main/java/com/storakle/mailgun/MailgunApiManager.java
+++ b/src/main/java/com/storakle/mailgun/MailgunApiManager.java
@@ -82,7 +82,11 @@ public List<SendMessageResponse> sendMessage(Message message, List<Recipient> re
                 // Prepare the recipient variables object.
                 ObjectNode recipientVariablesObject = objectMapper.createObjectNode();
                 recipient.getVariables().forEach((key, value) -> recipientVariablesObject.put(key, value));
-                recipientVariablesObject.put("id", i + 1);
+
+                if(!recipientVariablesObject.has("id"))
+                {
+                    recipientVariablesObject.put("id", i + 1);
+                }
 
                 recipientEmails.add(recipient.getEmail());