@@ -0,0 +1,35 @@
+import re
+
+
+class Emails(list):
+    """
+    This class keeps a list of unique and valid email addresses.
+    """
+
+    def __init__(self, emails: list) -> None:
+        super().__init__(self.validate(emails))
+
+    @property
+    def data(self) -> "Emails":
+        """
+        This property returns the email addresses.
+        """
+        return self
+
+    @staticmethod
+    def validate(emails: list) -> list:
+        """
+        This method checks the email addresses and removes the duplicates.
+        """
+        for email in emails:
+            if not isinstance(email, str):
+                raise ValueError(f"{email!r} is not a string")
+            if not re.fullmatch(r"[\w.+-]+@[\w-]+(\.[\w-]+)+", email):
+                raise ValueError(f"{email!r} is not a valid email address")
+        return list(dict.fromkeys(emails))
+
+    def __repr__(self) -> str:
+        return f"Emails({list(self)!r})"
+
+    def __str__(self) -> str:
+        return ", ".join(self)