diff --git a/synapse/push/mailer.py b/synapse/push/mailer.py
index 011bc4d2b1..e5c3929cd7 100644
--- a/synapse/push/mailer.py
+++ b/synapse/push/mailer.py
@@ -186,9 +186,7 @@ class Mailer(object):
 
         multipart_msg = MIMEMultipart('alternative')
         multipart_msg['Subject'] = "[%s] %s" % (self.app_name, summary_text)
-        multipart_msg['From'] = self.hs.config.email_notif_from % {
-            "app": self.app_name
-        }
+        multipart_msg['From'] = from_string
         multipart_msg['To'] = email_address
         multipart_msg['Date'] = email.utils.formatdate()
         multipart_msg['Message-ID'] = email.utils.make_msgid()