diff --git a/src/sshkey_tools/fields.py b/src/sshkey_tools/fields.py
index 638c6d5..7721188 100644
--- a/src/sshkey_tools/fields.py
+++ b/src/sshkey_tools/fields.py
@@ -1178,13 +1178,6 @@ def __validate_value__(self) -> Union[bool, Exception]:
                 f"{self.get_name()} Could not validate value, invalid type"
             )
 
-        for item in self.value:
-            if item not in self.ALLOWED_VALUES:
-                return _EX.InvalidDataException(
-                    f"Invalid extension '{item}'{NEWLINE}"
-                    + f"Allowed values are: {NEWLINE.join(self.ALLOWED_VALUES)}"
-                )
-
         return True
 
 
diff --git a/tests/test_certificates.py b/tests/test_certificates.py
index 48bb2a5..d80fa34 100644
--- a/tests/test_certificates.py
+++ b/tests/test_certificates.py
@@ -482,6 +482,8 @@ def test_extensions_field(self):
             "permit-port-forwarding",
             "permit-pty",
             "permit-user-rc",
+            "test@domain.net",
+            "abc@def.com"
         ]
 
         self.assertRandomResponse(
@@ -492,25 +494,6 @@ def test_extensions_field(self):
             ],
         )
 
-    def test_invalid_extensions_field(self):
-        field = _FIELD.CriticalOptionsField([ValueError, "permit-pty", b"unpermit"])
-        field.validate()
-
-        self.assertFieldContainsException(field, _EX.InvalidDataException)
-
-        field = _FIELD.CriticalOptionsField("InvalidData")
-        field.validate()
-
-        self.assertFieldContainsException(field, _EX.InvalidDataException)
-
-        field = _FIELD.CriticalOptionsField(["no-touch-required", "InvalidOption"])
-        field.validate()
-
-        self.assertFieldContainsException(field, _EX.InvalidDataException)
-
-        with self.assertRaises(_EX.InvalidDataException):
-            field.encode(ValueError)
-
     def test_reserved_field(self):
         self.assertExpectedResponse(_FIELD.ReservedField, "", b"\x00\x00\x00\x00")