diff --git a/docs/schema-command-issue-fixes.md b/docs/schema-command-issue-fixes.md
index ca0befbe..6a65c770 100644
--- a/docs/schema-command-issue-fixes.md
+++ b/docs/schema-command-issue-fixes.md
@@ -60,3 +60,10 @@ This document records issues found while packaging, building, and executing comm
 - Cause: the smoke harness had generic JSON samples and did not know which commands require non-empty objects or arrays.
 - Fix: Generated non-empty record payloads and command-specific non-empty JSON samples for aitable aggregate/card/field-widths/timebar updates.
 - Verification: targeted smoke for the remaining 20 paths passed 20/20, and the rebuilt CLI passed full smoke 359/359.
+
+### Issue 8: mail user smoke depended on bound mailbox auto-detection
+
+- Symptom: `mail.search_mail_users` failed in dry-run smoke on accounts without an enterprise mailbox, even after `dws auth login`, because the command attempted mailbox auto-detection when `--email` was omitted.
+- Cause: schema correctly marks `email` as optional for normal use, but the smoke harness used required parameters only; this made dry-run depend on the tester account's mailbox binding.
+- Fix: Added a smoke-only extra flag rule so `mail.search_mail_users` supplies a sample `--email` while leaving the runtime schema unchanged.
+- Verification: `dws mail user search --email user@example.com --keyword keyword-smoke --dry-run --yes --format json` passed; full smoke passed 359/359 after this fix.
diff --git a/scripts/dev/schema_command_smoke.py b/scripts/dev/schema_command_smoke.py
index 56e077b7..b1c9801f 100644
--- a/scripts/dev/schema_command_smoke.py
+++ b/scripts/dev/schema_command_smoke.py
@@ -161,14 +161,23 @@ def value_for(flag: str, param: dict[str, Any], canonical_path: str) -> str | No
     return scalar_value(flag, param, canonical_path)
 
 
+def smoke_extra_flags(canonical_path: str) -> set[str]:
+    # Avoid environment-dependent auto-detection in dry-run smoke. The command
+    # accepts --email as optional, but without it the CLI probes the bound mailbox.
+    return {
+        "mail.search_mail_users": {"email"},
+    }.get(canonical_path, set())
+
+
 def build_command(binary: str, leaf: dict[str, Any], include_optional: bool) -> list[str]:
     cli_path = str(leaf["cli_path"])
     canonical_path = str(leaf.get("canonical_path", ""))
+    extra_flags = smoke_extra_flags(canonical_path)
     argv = [binary, *shlex.split(cli_path)]
     params = leaf.get("parameters") or {}
     for flag in sorted(params):
         param = params[flag] or {}
-        if not include_optional and not bool(param.get("required")):
+        if not include_optional and not bool(param.get("required")) and flag not in extra_flags:
             continue
         if str(param.get("type", "")).lower() == "boolean":
             argv.append(f"--{flag}")