diff --git a/Week05/emails_sedasengul_ozkaya.py b/Week05/emails_sedasengul_ozkaya.py
new file mode 100644
index 00000000..9c3d44da
--- /dev/null
+++ b/Week05/emails_sedasengul_ozkaya.py
@@ -0,0 +1,28 @@
+import re
+
+class Emails(list):
+    def __init__(self, initial_data=None):
+        super().__init__()
+        self.data = self
+        
+        if initial_data is not None:
+            for item in initial_data:
+                if not isinstance(item, str):
+                    raise ValueError()
+                
+                if not self.validate(item):
+                    raise ValueError()
+                
+                if item not in self:
+                    self.append(item)
+
+    @staticmethod
+    def validate(email):
+        pattern = r"^[\w\.-]+@[\w\.-]+\.\w+$"
+        return bool(re.match(pattern, str(email)))
+
+    def __repr__(self):
+        return f"Emails({super().__repr__()})"
+
+    def __str__(self):
+        return super().__str__()