diff --git a/api/apps/__init__.py b/api/apps/__init__.py
index 007e37430..fba5d20b2 100644
--- a/api/apps/__init__.py
+++ b/api/apps/__init__.py
@@ -29,6 +29,7 @@ from api.db.db_models import close_connection
 from api.db.services import UserService
 from api.utils import CustomJSONEncoder, commands
 
+from flask_mail import Mail
 from flask_session import Session
 from flask_login import LoginManager
 from api import settings
@@ -40,6 +41,7 @@ __all__ = ["app"]
 Request.json = property(lambda self: self.get_json(force=True, silent=True))
 
 app = Flask(__name__)
+smtp_mail_server = Mail()
 
 # Add this at the beginning of your file to configure Swagger UI
 swagger_config = {
@@ -146,16 +148,16 @@ def load_user(web_request):
     if authorization:
         try:
             access_token = str(jwt.loads(authorization))
-            
+
             if not access_token or not access_token.strip():
                 logging.warning("Authentication attempt with empty access token")
                 return None
-            
+
             # Access tokens should be UUIDs (32 hex characters)
             if len(access_token.strip()) < 32:
                 logging.warning(f"Authentication attempt with invalid token format: {len(access_token)} chars")
                 return None
-            
+
             user = UserService.query(
                 access_token=access_token, status=StatusEnum.VALID.value
             )
diff --git a/api/apps/tenant_app.py b/api/apps/tenant_app.py
index 42b4d0a14..63c7f74b7 100644
--- a/api/apps/tenant_app.py
+++ b/api/apps/tenant_app.py
@@ -18,12 +18,14 @@ from flask import request
 from flask_login import login_required, current_user
 
 from api import settings
+from api.apps import smtp_mail_server
 from api.db import UserTenantRole, StatusEnum
 from api.db.db_models import UserTenant
 from api.db.services.user_service import UserTenantService, UserService
 
 from api.utils import get_uuid, delta_seconds
 from api.utils.api_utils import get_json_result, validate_request, server_error_response, get_data_error_result
+from api.utils.web_utils import send_invite_email
 
 
 @manager.route("/<tenant_id>/user/list", methods=["GET"])  # noqa: F821
@@ -78,6 +80,20 @@ def create(tenant_id):
         role=UserTenantRole.INVITE,
         status=StatusEnum.VALID.value)
 
+    if smtp_mail_server and settings.SMTP_CONF:
+        from threading import Thread
+
+        user_name = ""
+        _, user = UserService.get_by_id(current_user.id)
+        if user:
+            user_name = user.nickname
+
+        Thread(
+            target=send_invite_email,
+            args=(invite_user_email, settings.MAIL_FRONTEND_URL, tenant_id, user_name or current_user.email),
+            daemon=True
+        ).start()
+
     usr = invite_users[0].to_dict()
     usr = {k: v for k, v in usr.items() if k in ["id", "avatar", "email", "nickname"]}
 
diff --git a/api/ragflow_server.py b/api/ragflow_server.py
index 6d6c72ea1..8d0432012 100644
--- a/api/ragflow_server.py
+++ b/api/ragflow_server.py
@@ -33,7 +33,7 @@ import uuid
 
 from werkzeug.serving import run_simple
 from api import settings
-from api.apps import app
+from api.apps import app, smtp_mail_server
 from api.db.runtime_config import RuntimeConfig
 from api.db.services.document_service import DocumentService
 from api import utils
@@ -74,11 +74,11 @@ def signal_handler(sig, frame):
 
 if __name__ == '__main__':
     logging.info(r"""
-        ____   ___    ______ ______ __               
+        ____   ___    ______ ______ __
        / __ \ /   |  / ____// ____// /____  _      __
       / /_/ // /| | / / __ / /_   / // __ \| | /| / /
-     / _, _// ___ |/ /_/ // __/  / // /_/ /| |/ |/ / 
-    /_/ |_|/_/  |_|\____//_/    /_/ \____/ |__/|__/                             
+     / _, _// ___ |/ /_/ // __/  / // /_/ /| |/ |/ /
+    /_/ |_|/_/  |_|\____//_/    /_/ \____/ |__/|__/
 
     """)
     logging.info(
@@ -137,6 +137,18 @@ if __name__ == '__main__':
     else:
         threading.Timer(1.0, delayed_start_update_progress).start()
 
+    # init smtp server
+    if settings.SMTP_CONF:
+        app.config["MAIL_SERVER"] = settings.MAIL_SERVER
+        app.config["MAIL_PORT"] = settings.MAIL_PORT
+        app.config["MAIL_USE_SSL"] = settings.MAIL_USE_SSL
+        app.config["MAIL_USE_TLS"] = settings.MAIL_USE_TLS
+        app.config["MAIL_USERNAME"] = settings.MAIL_USERNAME
+        app.config["MAIL_PASSWORD"] = settings.MAIL_PASSWORD
+        app.config["MAIL_DEFAULT_SENDER"] = settings.MAIL_DEFAULT_SENDER
+        smtp_mail_server.init_app(app)
+
+
     # start http server
     try:
         logging.info("RAGFlow HTTP server start...")
diff --git a/api/settings.py b/api/settings.py
index f45483651..3148633e6 100644
--- a/api/settings.py
+++ b/api/settings.py
@@ -79,6 +79,16 @@ STRONG_TEST_COUNT = int(os.environ.get("STRONG_TEST_COUNT", "8"))
 
 BUILTIN_EMBEDDING_MODELS = ["BAAI/bge-large-zh-v1.5@BAAI", "maidalun1020/bce-embedding-base_v1@Youdao"]
 
+SMTP_CONF = None
+MAIL_SERVER = ""
+MAIL_PORT = 000
+MAIL_USE_SSL= True
+MAIL_USE_TLS = False
+MAIL_USERNAME = ""
+MAIL_PASSWORD = ""
+MAIL_DEFAULT_SENDER = ()
+MAIL_FRONTEND_URL = ""
+
 
 def get_or_create_secret_key():
     secret_key = os.environ.get("RAGFLOW_SECRET_KEY")
@@ -186,6 +196,21 @@ def init_settings():
         global SANDBOX_HOST
         SANDBOX_HOST = os.environ.get("SANDBOX_HOST", "sandbox-executor-manager")
 
+    global SMTP_CONF, MAIL_SERVER, MAIL_PORT, MAIL_USE_SSL, MAIL_USE_TLS
+    global MAIL_USERNAME, MAIL_PASSWORD, MAIL_DEFAULT_SENDER, MAIL_FRONTEND_URL
+    SMTP_CONF = get_base_config("smtp", {})
+
+    MAIL_SERVER = SMTP_CONF.get("mail_server", "")
+    MAIL_PORT = SMTP_CONF.get("mail_port", 000)
+    MAIL_USE_SSL = SMTP_CONF.get("mail_use_ssl", True)
+    MAIL_USE_TLS = SMTP_CONF.get("mail_use_tls", False)
+    MAIL_USERNAME = SMTP_CONF.get("mail_username", "")
+    MAIL_PASSWORD = SMTP_CONF.get("mail_password", "")
+    mail_default_sender = SMTP_CONF.get("mail_default_sender", [])
+    if mail_default_sender and len(mail_default_sender) >= 2:
+        MAIL_DEFAULT_SENDER = (mail_default_sender[0], mail_default_sender[1])
+    MAIL_FRONTEND_URL = SMTP_CONF.get("mail_frontend_url", "")
+
 
 class CustomEnum(Enum):
     @classmethod
diff --git a/api/utils/web_utils.py b/api/utils/web_utils.py
index 7bb25728e..55ce561ea 100644
--- a/api/utils/web_utils.py
+++ b/api/utils/web_utils.py
@@ -21,6 +21,9 @@ import re
 import socket
 from urllib.parse import urlparse
 
+from api.apps import smtp_mail_server
+from flask_mail import Message
+from flask import render_template_string
 from selenium import webdriver
 from selenium.common.exceptions import TimeoutException
 from selenium.webdriver.chrome.options import Options
@@ -31,6 +34,7 @@ from selenium.webdriver.support.ui import WebDriverWait
 from webdriver_manager.chrome import ChromeDriverManager
 
 
+
 CONTENT_TYPE_MAP = {
     # Office
     "docx": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
@@ -172,3 +176,26 @@ def get_float(req: dict, key: str, default: float | int = 10.0) -> float:
         return parsed if parsed > 0 else default
     except (TypeError, ValueError):
         return default
+
+
+INVITE_EMAIL_TMPL = """
+<p>Hi {{email}},</p>
+<p>{{inviter}} has invited you to join their team (ID: {{tenant_id}}).</p>
+<p>Click the link below to complete your registration:<br>
+<a href="{{invite_url}}">{{invite_url}}</a></p>
+<p>If you did not request this, please ignore this email.</p>
+"""
+
+def send_invite_email(to_email, invite_url, tenant_id, inviter):
+    from api.apps import  app
+    with app.app_context():
+        msg = Message(subject="RAGFlow Invitation",
+                      recipients=[to_email])
+        msg.html = render_template_string(
+            INVITE_EMAIL_TMPL,
+            email=to_email,
+            invite_url=invite_url,
+            tenant_id=tenant_id,
+            inviter=inviter,
+        )
+        smtp_mail_server.send(msg)
diff --git a/conf/service_conf.yaml b/conf/service_conf.yaml
index 9a995c2b2..7b76f2b4f 100644
--- a/conf/service_conf.yaml
+++ b/conf/service_conf.yaml
@@ -113,3 +113,14 @@ redis:
 #   switch: false
 #   component: false
 #   dataset: false
+# smtp:
+#   mail_server: ""
+#   mail_port: 465
+#   mail_use_ssl: true
+#   mail_use_tls: false
+#   mail_username: ""
+#   mail_password: ""
+#   mail_default_sender:
+#     - "RAGFlow" # display name
+#     - "" # sender email address
+#   mail_frontend_url: "https://your-frontend.example.com"
diff --git a/pyproject.toml b/pyproject.toml
index 891861d2b..3b4b46e84 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -130,6 +130,7 @@ dependencies = [
     "click>=8.1.8",
     "python-calamine>=0.4.0",
     "litellm>=1.74.15.post1",
+    "flask-mail>=0.10.0",
 ]
 
 [project.optional-dependencies]
diff --git a/uv.lock b/uv.lock
index c648e1369..53f891047 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,4 +1,5 @@
 version = 1
+revision = 1
 requires-python = ">=3.10, <3.13"
 resolution-markers = [
     "python_full_version >= '3.12' and sys_platform == 'darwin'",
@@ -1189,9 +1190,6 @@ name = "datrie"
 version = "0.8.2"
 source = { registry = "https://mirrors.aliyun.com/pypi/simple" }
 sdist = { url = "https://mirrors.aliyun.com/pypi/packages/9d/fe/db74bd405d515f06657f11ad529878fd389576dca4812bea6f98d9b31574/datrie-0.8.2.tar.gz", hash = "sha256:525b08f638d5cf6115df6ccd818e5a01298cd230b2dac91c8ff2e6499d18765d" }
-wheels = [
-    { url = "https://mirrors.aliyun.com/pypi/packages/44/02/53f0cf0bf0cd629ba6c2cc13f2f9db24323459e9c19463783d890a540a96/datrie-0.8.2-pp273-pypy_73-win32.whl", hash = "sha256:b07bd5fdfc3399a6dab86d6e35c72b1dbd598e80c97509c7c7518ab8774d3fda" },
-]
 
 [[package]]
 name = "debugpy"
@@ -1653,6 +1651,19 @@ wheels = [
     { url = "https://mirrors.aliyun.com/pypi/packages/59/f5/67e9cc5c2036f58115f9fe0f00d203cf6780c3ff8ae0e705e7a9d9e8ff9e/Flask_Login-0.6.3-py3-none-any.whl", hash = "sha256:849b25b82a436bf830a054e74214074af59097171562ab10bfa999e6b78aae5d" },
 ]
 
+[[package]]
+name = "flask-mail"
+version = "0.10.0"
+source = { registry = "https://mirrors.aliyun.com/pypi/simple" }
+dependencies = [
+    { name = "blinker" },
+    { name = "flask" },
+]
+sdist = { url = "https://mirrors.aliyun.com/pypi/packages/ba/29/e92dc84c675d1e8d260d5768eb3fb65c70cbd33addecf424187587bee862/flask_mail-0.10.0.tar.gz", hash = "sha256:44083e7b02bbcce792209c06252f8569dd5a325a7aaa76afe7330422bd97881d" }
+wheels = [
+    { url = "https://mirrors.aliyun.com/pypi/packages/e4/c0/a81083da779f482494d49195d8b6c9fde21072558253e4a9fb2ec969c3c1/flask_mail-0.10.0-py3-none-any.whl", hash = "sha256:a451e490931bb3441d9b11ebab6812a16bfa81855792ae1bf9c1e1e22c4e51e7" },
+]
+
 [[package]]
 name = "flask-session"
 version = "0.8.0"
@@ -4664,8 +4675,6 @@ wheels = [
     { url = "https://mirrors.aliyun.com/pypi/packages/59/fe/aae679b64363eb78326c7fdc9d06ec3de18bac68be4b612fc1fe8902693c/pycryptodome-3.23.0-cp37-abi3-win32.whl", hash = "sha256:507dbead45474b62b2bbe318eb1c4c8ee641077532067fec9c1aa82c31f84886" },
     { url = "https://mirrors.aliyun.com/pypi/packages/54/2f/e97a1b8294db0daaa87012c24a7bb714147c7ade7656973fd6c736b484ff/pycryptodome-3.23.0-cp37-abi3-win_amd64.whl", hash = "sha256:c75b52aacc6c0c260f204cbdd834f76edc9fb0d8e0da9fbf8352ef58202564e2" },
     { url = "https://mirrors.aliyun.com/pypi/packages/18/3d/f9441a0d798bf2b1e645adc3265e55706aead1255ccdad3856dbdcffec14/pycryptodome-3.23.0-cp37-abi3-win_arm64.whl", hash = "sha256:11eeeb6917903876f134b56ba11abe95c0b0fd5e3330def218083c7d98bbcb3c" },
-    { url = "https://mirrors.aliyun.com/pypi/packages/9f/7c/f5b0556590e7b4e710509105e668adb55aa9470a9f0e4dea9c40a4a11ce1/pycryptodome-3.23.0-pp27-pypy_73-manylinux2010_x86_64.whl", hash = "sha256:350ebc1eba1da729b35ab7627a833a1a355ee4e852d8ba0447fafe7b14504d56" },
-    { url = "https://mirrors.aliyun.com/pypi/packages/33/38/dcc795578d610ea1aaffef4b148b8cafcfcf4d126b1e58231ddc4e475c70/pycryptodome-3.23.0-pp27-pypy_73-win32.whl", hash = "sha256:93837e379a3e5fd2bb00302a47aee9fdf7940d83595be3915752c74033d17ca7" },
     { url = "https://mirrors.aliyun.com/pypi/packages/d9/12/e33935a0709c07de084d7d58d330ec3f4daf7910a18e77937affdb728452/pycryptodome-3.23.0-pp310-pypy310_pp73-macosx_10_15_x86_64.whl", hash = "sha256:ddb95b49df036ddd264a0ad246d1be5b672000f12d6961ea2c267083a5e19379" },
     { url = "https://mirrors.aliyun.com/pypi/packages/22/0b/aa8f9419f25870889bebf0b26b223c6986652bdf071f000623df11212c90/pycryptodome-3.23.0-pp310-pypy310_pp73-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:d8e95564beb8782abfd9e431c974e14563a794a4944c29d6d3b7b5ea042110b4" },
     { url = "https://mirrors.aliyun.com/pypi/packages/d4/5e/63f5cbde2342b7f70a39e591dbe75d9809d6338ce0b07c10406f1a140cdc/pycryptodome-3.23.0-pp310-pypy310_pp73-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:14e15c081e912c4b0d75632acd8382dfce45b258667aa3c67caf7a4d4c13f630" },
@@ -4689,8 +4698,6 @@ wheels = [
     { url = "https://mirrors.aliyun.com/pypi/packages/48/7d/0f2b09490b98cc6a902ac15dda8760c568b9c18cfe70e0ef7a16de64d53a/pycryptodomex-3.20.0-cp35-abi3-musllinux_1_1_x86_64.whl", hash = "sha256:7a7a8f33a1f1fb762ede6cc9cbab8f2a9ba13b196bfaf7bc6f0b39d2ba315a43" },
     { url = "https://mirrors.aliyun.com/pypi/packages/b0/1c/375adb14b71ee1c8d8232904e928b3e7af5bbbca7c04e4bec94fe8e90c3d/pycryptodomex-3.20.0-cp35-abi3-win32.whl", hash = "sha256:c39778fd0548d78917b61f03c1fa8bfda6cfcf98c767decf360945fe6f97461e" },
     { url = "https://mirrors.aliyun.com/pypi/packages/b2/e8/1b92184ab7e5595bf38000587e6f8cf9556ebd1bf0a583619bee2057afbd/pycryptodomex-3.20.0-cp35-abi3-win_amd64.whl", hash = "sha256:2a47bcc478741b71273b917232f521fd5704ab4b25d301669879e7273d3586cc" },
-    { url = "https://mirrors.aliyun.com/pypi/packages/e7/c5/9140bb867141d948c8e242013ec8a8011172233c898dfdba0a2417c3169a/pycryptodomex-3.20.0-pp27-pypy_73-manylinux2010_x86_64.whl", hash = "sha256:1be97461c439a6af4fe1cf8bf6ca5936d3db252737d2f379cc6b2e394e12a458" },
-    { url = "https://mirrors.aliyun.com/pypi/packages/5e/6a/04acb4978ce08ab16890c70611ebc6efd251681341617bbb9e53356dee70/pycryptodomex-3.20.0-pp27-pypy_73-win32.whl", hash = "sha256:19764605feea0df966445d46533729b645033f134baeb3ea26ad518c9fdf212c" },
     { url = "https://mirrors.aliyun.com/pypi/packages/eb/df/3f1ea084e43b91e6d2b6b3493cc948864c17ea5d93ff1261a03812fbfd1a/pycryptodomex-3.20.0-pp310-pypy310_pp73-macosx_10_9_x86_64.whl", hash = "sha256:f2e497413560e03421484189a6b65e33fe800d3bd75590e6d78d4dfdb7accf3b" },
     { url = "https://mirrors.aliyun.com/pypi/packages/c9/f3/83ffbdfa0c8f9154bcd8866895f6cae5a3ec749da8b0840603cf936c4412/pycryptodomex-3.20.0-pp310-pypy310_pp73-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:e48217c7901edd95f9f097feaa0388da215ed14ce2ece803d3f300b4e694abea" },
     { url = "https://mirrors.aliyun.com/pypi/packages/c9/9d/c113e640aaf02af5631ae2686b742aac5cd0e1402b9d6512b1c7ec5ef05d/pycryptodomex-3.20.0-pp310-pypy310_pp73-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:d00fe8596e1cc46b44bf3907354e9377aa030ec4cd04afbbf6e899fc1e2a7781" },
@@ -5293,6 +5300,7 @@ dependencies = [
     { name = "flask" },
     { name = "flask-cors" },
     { name = "flask-login" },
+    { name = "flask-mail" },
     { name = "flask-session" },
     { name = "google-generativeai" },
     { name = "google-search-results" },
@@ -5447,6 +5455,7 @@ requires-dist = [
     { name = "flask", specifier = "==3.0.3" },
     { name = "flask-cors", specifier = "==5.0.0" },
     { name = "flask-login", specifier = "==0.6.3" },
+    { name = "flask-mail", specifier = ">=0.10.0" },
     { name = "flask-session", specifier = "==0.8.0" },
     { name = "google-generativeai", specifier = ">=0.8.1,<0.9.0" },
     { name = "google-search-results", specifier = "==2.4.2" },
@@ -5492,7 +5501,7 @@ requires-dist = [
     { name = "pyicu", specifier = ">=2.13.1,<3.0.0" },
     { name = "pymysql", specifier = ">=1.1.1,<2.0.0" },
     { name = "pyodbc", specifier = ">=5.2.0,<6.0.0" },
-    { name = "pypdf", specifier = "===6.0.0" },
+    { name = "pypdf", specifier = "==6.0.0" },
     { name = "pypdf2", specifier = ">=3.0.1,<4.0.0" },
     { name = "python-calamine", specifier = ">=0.4.0" },
     { name = "python-dateutil", specifier = "==2.8.2" },
@@ -5539,6 +5548,7 @@ requires-dist = [
     { name = "yfinance", specifier = "==0.2.65" },
     { name = "zhipuai", specifier = "==2.0.1" },
 ]
+provides-extras = ["full"]
 
 [package.metadata.requires-dev]
 test = [