diff --git a/distgit_bugzilla_sync/script.py b/distgit_bugzilla_sync/script.py
index 8d545f5..00d3d26 100644
--- a/distgit_bugzilla_sync/script.py
+++ b/distgit_bugzilla_sync/script.py
@@ -937,11 +937,16 @@ class DistgitBugzillaSync:
             if project["namespace"] not in self.env["pdc_types"]:
                 project["branches"] = []
                 project["products"] = []
-                self.errors["configuration"].append(
-                    f'Namespace `{project["namespace"]}` not found in the pdc_type '
-                    f'configuration key, project {project["namespace"]}/{project["name"]} '
-                    "ignored"
-                )
+                error = f'Namespace `{project["namespace"]}` not found in the pdc_type ' \
+                    f'configuration key -- ignoring it'
+                if not error in self.errors["configuration"]:
+                    self.errors["configuration"].append(error)
+                if self.env["verbose"]:
+                    print(
+                        f'Namespace `{project["namespace"]}` not found in the pdc_type '
+                        f'configuration key, project {project["namespace"]}/{project["name"]} '
+                        "ignored"
+                    )
                 continue
 
             pdc_type = self.env["pdc_types"][project["namespace"]]
@@ -1156,7 +1161,10 @@ class DistgitBugzillaSync:
             if self.env["verbose"] or self.env["dryrun"]:
                 print("*" * 80)
                 print("\n".join(report))
-            if not self.env["dryrun"]:
+
+            # Do not send the email in dryrun or when the error only relates to
+            # configuration (which will always happen for flatpaks and tests)
+            if not self.env["dryrun"] and list(self.errors.keys()) != ["configuration"]:
                 self.send_email(
                     self.env["email"]["from"],
                     self.env["email"]["notify_admins"],