diff --git a/app/__init__.py b/app/__init__.py
index f26aaaa..8fe9131 100644
--- a/app/__init__.py
+++ b/app/__init__.py
@@ -1,3 +1,4 @@
+__version__ = "1.1.0"
 import os
 from flask import Flask, render_template, jsonify
 from app.db import db
diff --git a/app/api/emails.py b/app/api/emails.py
index df1f314..b1cf42d 100644
--- a/app/api/emails.py
+++ b/app/api/emails.py
@@ -1,6 +1,6 @@
 from flask import Blueprint, jsonify, request
 from app.models import Account
-from app.services import graph, imap, verification
+from app.services import graph, imap, smtp, verification
 import os
 
 bp = Blueprint("emails", __name__, url_prefix="/api/emails")
@@ -28,7 +28,6 @@ def get_emails():
             token = token_res["access_token"]
             messages = graph.fetch_messages(token, top=15, proxy_url=proxy_url)
     else:
-        # Fallback to IMAP
         messages = imap.fetch_inbox_messages(
             email=acct.email,
             password=acct.password or acct.refresh_token,
@@ -51,3 +50,52 @@ def get_emails():
         })
         
     return jsonify(results)
+
+@bp.post("/send")
+def send_email():
+    data = request.json or {}
+    email = data.get("email")
+    to_email = data.get("to_email")
+    subject = data.get("subject", "No Subject")
+    body = data.get("body", "")
+    
+    if not email or not to_email:
+        return jsonify({"error": "email and to_email required"}), 400
+        
+    acct = Account.query.filter_by(email=email).first()
+    if not acct:
+        return jsonify({"error": "account not found"}), 404
+        
+    proxy_url = os.getenv("PROXY_URL")
+    
+    if acct.method == "graph":
+        token_res = graph.get_access_token_graph_result(
+            client_id=acct.client_id,
+            refresh_token=acct.refresh_token,
+            proxy_url=proxy_url
+        )
+        if isinstance(token_res, dict) and "access_token" in token_res:
+            token = token_res["access_token"]
+            success = graph.send_mail_graph(token, to_email, subject, body, proxy_url=proxy_url)
+            if success:
+                return jsonify({"success": True, "message": "Email sent via Graph API"})
+            return jsonify({"error": "Graph API send mail failed"}), 500
+        return jsonify({"error": "Token refresh failed"}), 400
+    else:
+        try:
+            success = smtp.send_mail_smtp(
+                host=os.getenv("SMTP_HOST", "smtp.office365.com"),
+                port=int(os.getenv("SMTP_PORT", "587")),
+                username=acct.email,
+                password=acct.password or acct.refresh_token,
+                to_email=to_email,
+                subject=subject,
+                body_text=body,
+                use_tls=True
+            )
+            if success:
+                return jsonify({"success": True, "message": "Email sent via SMTP"})
+        except Exception as e:
+            return jsonify({"error": f"SMTP send mail failed: {str(e)}"}), 500
+            
+    return jsonify({"error": "Send mail failed"}), 500
diff --git a/app/services/graph.py b/app/services/graph.py
index 12224a3..9b74e7c 100644
--- a/app/services/graph.py
+++ b/app/services/graph.py
@@ -420,3 +420,32 @@ def delete_emails_graph(
         )
 
     return result
+
+
+def send_mail_graph(access_token: str, to_email: str, subject: str, body_text: str, proxy_url: str = None) -> bool:
+    """使用 Microsoft Graph API 发送邮件"""
+    url = "https://graph.microsoft.com/v1.0/me/sendMail"
+    headers = {
+        "Authorization": f"Bearer {access_token}",
+        "Content-Type": "application/json"
+    }
+    payload = {
+        "message": {
+            "subject": subject,
+            "body": {
+                "contentType": "Text",
+                "content": body_text
+            },
+            "toRecipients": [
+                {
+                    "emailAddress": {
+                        "address": to_email
+                    }
+                }
+            ]
+        },
+        "saveToSentItems": "true"
+    }
+    proxies = build_proxies(proxy_url) if "build_proxies" in globals() else ({"http": proxy_url, "https": proxy_url} if proxy_url else None)
+    res = requests.post(url, json=payload, headers=headers, proxies=proxies, timeout=30)
+    return res.status_code in (200, 202)
diff --git a/app/services/smtp.py b/app/services/smtp.py
new file mode 100644
index 0000000..354e67b
--- /dev/null
+++ b/app/services/smtp.py
@@ -0,0 +1,22 @@
+import smtplib
+from email.message import EmailMessage
+
+def send_mail_smtp(host: str, port: int, username: str, password: str, to_email: str, subject: str, body_text: str, use_tls: bool = True, use_ssl: bool = False) -> bool:
+    """使用 SMTP 协议发送邮件"""
+    msg = EmailMessage()
+    msg["Subject"] = subject
+    msg["From"] = username
+    msg["To"] = to_email
+    msg.set_content(body_text)
+
+    if use_ssl:
+        with smtplib.SMTP_SSL(host, port, timeout=20) as server:
+            server.login(username, password)
+            server.send_message(msg)
+    else:
+        with smtplib.SMTP(host, port, timeout=20) as server:
+            if use_tls:
+                server.starttls()
+            server.login(username, password)
+            server.send_message(msg)
+    return True