diff --git a/src/tg_bot.py b/src/tg_bot.py
index 2c8e21d..2593caa 100644
--- a/src/tg_bot.py
+++ b/src/tg_bot.py
@@ -217,8 +217,9 @@ def _link_buttons(links: list | None) -> list:
     rows = []
     for link in unsub_links + other_links:
         url = link.get("url", "")
-        # 校验 URL：合法 http/https，无多重协议头，长度合理
-        if not (url.startswith("http") and url.count("://") == 1 and len(url) < 200):
+        # 校验 URL：合法 http/https，无多重协议头，长度合理。
+        # 退订链接常带长 tracking 参数（实测 OpenAI 的 >700 字符），上限放宽到 2048
+        if not (url.startswith("http") and url.count("://") == 1 and len(url) < 2048):
             continue
         text = (link.get("text") or "").strip()[:30]
         if not text:
diff --git a/tests/test_unsub_keyboard.py b/tests/test_unsub_keyboard.py
index 8fe0692..486577b 100644
--- a/tests/test_unsub_keyboard.py
+++ b/tests/test_unsub_keyboard.py
@@ -75,7 +75,7 @@ def test_unsub_link_sorted_before_other_links():
 
 
 def test_invalid_url_filtered():
-    """非法 URL（非 http、多重协议头、超长）被过滤"""
+    """非法 URL（非 http、多重协议头）被过滤"""
     links = [
         {"text": "退订", "url": "javascript:alert(1)"},
         {"text": "退订", "url": "https://x.com/https://evil.com"},
@@ -83,4 +83,23 @@ def test_invalid_url_filtered():
     ]
     rows = _link_buttons(links)
     assert len(rows) == 1
-    assert rows[0][0]["url"] == "https://ok.example.com/unsub"
\ No newline at end of file
+    assert rows[0][0]["url"] == "https://ok.example.com/unsub"
+
+
+def test_long_unsub_url_rendered():
+    """长 tracking 退订链接（如 OpenAI 的 >700 字符）必须渲染，不能被长度过滤误杀"""
+    url = "https://r.openai.com/asm/unsubscribe/?user_id=108370056&data=" + "x" * 700
+    assert len(url) > 200
+    links = [{"text": "取消订阅", "url": url}]
+    rows = _link_buttons(links)
+    assert len(rows) == 1
+    assert rows[0][0]["url"] == url
+    assert "🔕" in rows[0][0]["text"]
+
+
+def test_oversized_url_filtered():
+    """超过 2048 的 URL 仍被过滤"""
+    url = "https://example.com/" + "x" * 2100
+    links = [{"text": "退订", "url": url}]
+    rows = _link_buttons(links)
+    assert rows == []
\ No newline at end of file