diff --git a/openai_pool_orchestrator/mail_providers.py b/openai_pool_orchestrator/mail_providers.py
index 3965872..128797f 100755
--- a/openai_pool_orchestrator/mail_providers.py
+++ b/openai_pool_orchestrator/mail_providers.py
@@ -398,9 +398,10 @@ class MoeMailProvider(MailProvider):
 # ==================== DuckMail ====================
 
 class DuckMailProvider(MailProvider):
-    def __init__(self, api_base: str = "https://api.duckmail.sbs", bearer_token: str = ""):
+    def __init__(self, api_base: str = "https://api.duckmail.sbs", bearer_token: str = "", domain: str = ""):
         self.api_base = api_base.rstrip("/")
         self.bearer_token = bearer_token
+        self.domain = str(domain).strip()
 
     def _auth_headers(self, token: str = "") -> Dict[str, str]:
         h: Dict[str, str] = {"Accept": "application/json"}
@@ -419,17 +420,19 @@ class DuckMailProvider(MailProvider):
                 headers["Authorization"] = f"Bearer {self.bearer_token}"
 
             try:
-                domains_resp = session.get(f"{self.api_base}/domains", headers={"Accept": "application/json"}, timeout=15, verify=False)
-                if domains_resp.status_code != 200:
-                    return "", ""
-                data = domains_resp.json()
-                items = data if isinstance(data, list) else (data.get("hydra:member") or [])
-                domains = [str(i.get("domain") or "") for i in items if isinstance(i, dict) and i.get("domain") and i.get("isActive", True)]
-                if not domains:
-                    return "", ""
-                # 优先使用 duckmail.sbs 主域名，避免临时域名被 OpenAI 封禁
-                _preferred = [d for d in domains if "duckmail" in d.lower()]
-                domain = random.choice(_preferred) if _preferred else random.choice(domains)
+                domain = self.domain
+                if not domain:
+                    domains_resp = session.get(f"{self.api_base}/domains", headers={"Accept": "application/json"}, timeout=15, verify=False)
+                    if domains_resp.status_code != 200:
+                        return "", ""
+                    data = domains_resp.json()
+                    items = data if isinstance(data, list) else (data.get("hydra:member") or [])
+                    domains = [str(i.get("domain") or "") for i in items if isinstance(i, dict) and i.get("domain") and i.get("isActive", True)]
+                    if not domains:
+                        return "", ""
+                    # 优先使用 duckmail.sbs 主域名，避免临时域名被 OpenAI 封禁
+                    _preferred = [d for d in domains if "duckmail" in d.lower()]
+                    domain = random.choice(_preferred) if _preferred else random.choice(domains)
 
                 local = f"oc{secrets.token_hex(5)}"
                 email = f"{local}@{domain}"
@@ -793,6 +796,7 @@ def create_provider_by_name(provider_type: str, mail_cfg: Dict[str, Any]) -> Mai
         return DuckMailProvider(
             api_base=api_base or "https://api.duckmail.sbs",
             bearer_token=str(mail_cfg.get("bearer_token", "")).strip(),
+            domain=str(mail_cfg.get("domain", "")).strip(),
         )
     elif provider_type == "cloudflare_temp_email":
         return CloudflareTempEmailProvider(
diff --git a/openai_pool_orchestrator/static/index.html b/openai_pool_orchestrator/static/index.html
index eabdf1e..66554ab 100755
--- a/openai_pool_orchestrator/static/index.html
+++ b/openai_pool_orchestrator/static/index.html
@@ -632,6 +632,11 @@
                   <input type="text" data-key="api_base" placeholder="https://api.duckmail.sbs" autocomplete="off"
                     spellcheck="false" />
                 </div>
+                <div class="config-field">
+                  <label>分配域名</label>
+                  <input type="text" data-key="domain" placeholder="example.com" autocomplete="off"
+                    spellcheck="false" />
+                </div>
                 <div class="config-field">
                   <label>Bearer Token</label>
                   <input type="password" data-key="bearer_token" placeholder="DuckMail Bearer Token"