diff --git a/google/ads/datamanager_util/format.py b/google/ads/datamanager_util/format.py
index 197f2ca..865f2bb 100644
--- a/google/ads/datamanager_util/format.py
+++ b/google/ads/datamanager_util/format.py
@@ -90,6 +90,9 @@ def format_email_address(self, email: str) -> str:
             # "Create variations of your email address" at:
             # https://support.google.com/a/users/answer/9282734
 
+            # Removes plus sign (+) and all characters that follow it.
+            user = user.split("+")[0]
+
             # Removes all periods (.).
             user = re.sub("\\.", "", user)
             if len(user) == 0:
diff --git a/tests/formatter_test.py b/tests/formatter_test.py
index cbb48c9..afd3119 100644
--- a/tests/formatter_test.py
+++ b/tests/formatter_test.py
@@ -49,6 +49,24 @@ def test_format_email_address_valid_inputs(self):
             "Periods should be stripped from googlemail.com address",
         )
 
+        self.assertEqual(
+            "cloudysanfrancisco@googlemail.com",
+            self.formatter.format_email_address("Cloudy.SanFrancisco+shopping@googlemail.com"),
+            "Plus sign and everything after should be stripped from googlemail.com address",
+        )
+
+        self.assertEqual(
+            "cloudysanfrancisco@gmail.com",
+            self.formatter.format_email_address("Cloudy.SanFrancisco+shopping@gmail.com"),
+            "Plus sign and everything after should be stripped from gmail.com address",
+        )
+
+        self.assertEqual(
+            "user.name+nyc@example.com",
+            self.formatter.format_email_address("user.name+NYC@Example.com"),
+            "Plus sign and everything after should not be stripped from non google emails",
+        )
+
     def test_format_email_address_invalid_inputs(self):
         with self.assertRaises(ValueError):
             self.formatter.format_email_address(None)