diff --git a/sbc_compassion/models/correspondence.py b/sbc_compassion/models/correspondence.py
index 8744cd3bc..aa17059c7 100644
--- a/sbc_compassion/models/correspondence.py
+++ b/sbc_compassion/models/correspondence.py
@@ -1364,6 +1364,8 @@ def check_postponed_christmas_letters(self):
                     ("kit_identifier", "=", False),
                     ("state", "=", "Exception"),
                     ("on_hold", "=", True),
+                    # Released with the project reactivation instead
+                    ("child_id.project_id.hold_s2b_letters", "!=", True),
                 ]
             )
             correspondences.reactivate_letters(_("Christmas period started"))
diff --git a/thankyou_letters/models/account_move_line.py b/thankyou_letters/models/account_move_line.py
index 8cb1bc28d..08794182a 100644
--- a/thankyou_letters/models/account_move_line.py
+++ b/thankyou_letters/models/account_move_line.py
@@ -102,7 +102,14 @@ def generate_thank_you(self):
 
         all_thanks_config_ids = (
             self.env["partner.communication.config"]
-            .search([("send_mode_pref_field", "like", "thankyou_preference")])
+            .search(
+                [
+                    ("send_mode_pref_field", "like", "thankyou_preference"),
+                    # Other configs (e.g. third party letters on res.partner)
+                    # share the preference field but not the model.
+                    ("model_id.model", "=", self._name),
+                ]
+            )
             .ids
         )