diff --git a/src/govoplan_mail/backend/mail_profiles.py b/src/govoplan_mail/backend/mail_profiles.py
index 1f275d3..af09797 100644
--- a/src/govoplan_mail/backend/mail_profiles.py
+++ b/src/govoplan_mail/backend/mail_profiles.py
@@ -285,11 +285,15 @@ def _legacy_tenant_settings(session: Session, tenant_id: str) -> dict[str, Any]
     return _json_object(row[0]) if row else None
 
 
-def _legacy_subject_policy(session: Session, *, table_name: str, tenant_id: str, scope_id: str) -> dict[str, Any] | None:
-    if table_name not in {"access_users", "access_groups"}:
+def _legacy_subject_policy(session: Session, *, subject_type: str, tenant_id: str, scope_id: str) -> dict[str, Any] | None:
+    if subject_type == "user":
+        statement = text("select mail_profile_policy from access_users where id = :scope_id and tenant_id = :tenant_id")
+    elif subject_type == "group":
+        statement = text("select mail_profile_policy from access_groups where id = :scope_id and tenant_id = :tenant_id")
+    else:
         raise MailProfileError("Unsupported mail policy subject")
     row = session.execute(
-        text(f"select mail_profile_policy from {table_name} where id = :scope_id and tenant_id = :tenant_id"),
+        statement,
         {"scope_id": scope_id, "tenant_id": tenant_id},
     ).first()
     return _json_object(row[0]) if row else None
@@ -304,7 +308,7 @@ def _user_exists(session: Session, *, tenant_id: str, user_id: str) -> bool:
     if directory is not None:
         user = directory.get_user(user_id)
         return bool(user and user.tenant_id == tenant_id and user.status == "active")
-    return _legacy_subject_policy(session, table_name="access_users", tenant_id=tenant_id, scope_id=user_id) is not None
+    return _legacy_subject_policy(session, subject_type="user", tenant_id=tenant_id, scope_id=user_id) is not None
 
 
 def _group_exists(session: Session, *, tenant_id: str, group_id: str) -> bool:
@@ -312,7 +316,7 @@ def _group_exists(session: Session, *, tenant_id: str, group_id: str) -> bool:
     if directory is not None:
         group = directory.get_group(group_id)
         return bool(group and group.tenant_id == tenant_id and group.status == "active")
-    return _legacy_subject_policy(session, table_name="access_groups", tenant_id=tenant_id, scope_id=group_id) is not None
+    return _legacy_subject_policy(session, subject_type="group", tenant_id=tenant_id, scope_id=group_id) is not None
 
 
 def _policy_scope_key(*, tenant_id: str, scope_type: str, scope_id: str | None) -> tuple[str | None, str, str | None]:
@@ -356,10 +360,10 @@ def _legacy_mail_profile_policy(
     if not scope_id:
         return None
     if clean_scope == "user":
-        legacy = _legacy_subject_policy(session, table_name="access_users", tenant_id=tenant_id, scope_id=scope_id)
+        legacy = _legacy_subject_policy(session, subject_type="user", tenant_id=tenant_id, scope_id=scope_id)
         return _policy_from_attr(legacy) if legacy is not None else None
     if clean_scope == "group":
-        legacy = _legacy_subject_policy(session, table_name="access_groups", tenant_id=tenant_id, scope_id=scope_id)
+        legacy = _legacy_subject_policy(session, subject_type="group", tenant_id=tenant_id, scope_id=scope_id)
         return _policy_from_attr(legacy) if legacy is not None else None
     try:
         context = _campaign_policy_context(session, tenant_id=tenant_id, campaign_id=scope_id)
diff --git a/webui/src/features/mail/mailPolicyValidation.ts b/webui/src/features/mail/mailPolicyValidation.ts
index 2ee6c72..185e0b3 100644
--- a/webui/src/features/mail/mailPolicyValidation.ts
+++ b/webui/src/features/mail/mailPolicyValidation.ts
@@ -88,10 +88,39 @@ export function wildcardPatternMatches(pattern: string, rawValue: string): boole
   const normalizedPattern = pattern.trim();
   const value = rawValue.trim();
   if (!normalizedPattern || !value) return false;
-  if (normalizedPattern === "*") return true;
-  const escaped = normalizedPattern.replace(/[.+^${}()|[\]\\]/g, "\\$&");
-  const regex = `^${escaped.replace(/\*/g, ".*").replace(/\?/g, ".")}$`;
-  return new RegExp(regex, "i").test(value);
+  return wildcardMatch(normalizedPattern.toLowerCase(), value.toLowerCase());
+}
+
+function wildcardMatch(pattern: string, value: string): boolean {
+  let patternIndex = 0;
+  let valueIndex = 0;
+  let starIndex = -1;
+  let valueRetryIndex = 0;
+
+  while (valueIndex < value.length) {
+    const token = pattern[patternIndex];
+    if (token === "?" || token === value[valueIndex]) {
+      patternIndex += 1;
+      valueIndex += 1;
+      continue;
+    }
+    if (token === "*") {
+      starIndex = patternIndex;
+      valueRetryIndex = valueIndex;
+      patternIndex += 1;
+      continue;
+    }
+    if (starIndex !== -1) {
+      patternIndex = starIndex + 1;
+      valueRetryIndex += 1;
+      valueIndex = valueRetryIndex;
+      continue;
+    }
+    return false;
+  }
+
+  while (pattern[patternIndex] === "*") patternIndex += 1;
+  return patternIndex === pattern.length;
 }
 
 function patternsFor(
@@ -117,4 +146,4 @@ function normalizeDomain(value: string | null | undefined): string {
   if (!trimmed) return "";
   const emailDomain = trimmed.includes("@") ? trimmed.split("@").pop() ?? "" : trimmed;
   return emailDomain.replace(/^@+/, "");
-}
\ No newline at end of file
+}