diff --git a/postmarker/models/emails.py b/postmarker/models/emails.py
index 70d3a07..3fad0b1 100644
--- a/postmarker/models/emails.py
+++ b/postmarker/models/emails.py
@@ -380,6 +380,7 @@ def send_with_template(
         TrackLinks="None",
         Attachments=None,
         InlineCss=True,
+        Metadata=None,
     ):
         return self.EmailTemplate(
             TemplateId=TemplateId,
@@ -397,6 +398,7 @@ def send_with_template(
             TrackLinks=TrackLinks,
             Attachments=Attachments,
             InlineCss=InlineCss,
+            Metadata=Metadata,
         ).send()
 
     def send_batch(self, *emails, **extra):
@@ -467,6 +469,7 @@ def EmailTemplate(
         TrackLinks="None",
         Attachments=None,
         InlineCss=True,
+        Metadata=None,
     ):
         """
         Constructs :py:class:`EmailTemplate` instance.
@@ -490,6 +493,7 @@ def EmailTemplate(
             TrackLinks=TrackLinks,
             Attachments=Attachments,
             InlineCss=InlineCss,
+            Metadata=Metadata,
         )
 
     def EmailBatch(self, *emails):