fix(proxy_server.py): support smtp email auth

previously was a hard resend package dependency. removed in favor of allowing any smtp server connection (including resend)

litellm/proxy/proxy_server.py

@@ -70,6 +70,7 @@ from litellm.proxy.utils import (
     get_instance_fn,
     ProxyLogging,
     _cache_user_row,
+    send_email,
 )
 from litellm.proxy.secret_managers.google_kms import load_google_kms
 import pydantic
@@ -1742,11 +1743,12 @@ async def user_auth(request: Request):
     ```
 
     Requirements:
-    This uses [Resend](https://resend.com/) for sending emails. Needs these 2 keys in your .env:
-    ```env
-    RESEND_API_KEY = "my-resend-api-key"
-    RESEND_API_EMAIL = "my-sending-email"
-    ```
+    SMTP server details saved in .env:
+    - os.environ["SMTP_HOST"]
+    - os.environ["SMTP_PORT"]
+    - os.environ["SMTP_USERNAME"]
+    - os.environ["SMTP_PASSWORD"]
+    - os.environ["SMTP_SENDER_EMAIL"]
     """
     global prisma_client
 
@@ -1756,15 +1758,6 @@ async def user_auth(request: Request):
     if user_email is None:
         raise HTTPException(status_code=400, detail="User email is none")
 
-    import os
-
-    try:
-        import resend
-    except ImportError:
-        raise Exception(
-            "Resend package missing. Run `pip install litellm[extra_proxy]` to add missing dependencies."
-        )
-
     if prisma_client is None:  # if no db connected, raise an error
         raise Exception("No connected db.")
 
@@ -1785,16 +1778,15 @@ async def user_auth(request: Request):
 
     base_url = os.getenv("LITELLM_HOSTED_UI", "https://dashboard.litellm.ai/")
 
-    resend.api_key = os.getenv("RESEND_API_KEY")
-
     params = {
-        "from": f"LiteLLM Proxy <{os.getenv('RESEND_API_EMAIL')}>",
-        "to": [user_email],
+        "sender_name": "LiteLLM Proxy",
+        "sender_email": os.getenv("SMTP_SENDER_EMAIL"),
+        "receiver_email": user_email,
         "subject": "Your Magic Link",
         "html": f"<strong> Follow this  link, to login:\n\n{base_url}user/?token={response['token']}&user_id={response['user_id']}&page={page_params}</strong>",
     }
 
-    email = resend.Emails.send(params)
+    await send_email(**params)
     return "Email sent!"
 
 

litellm/proxy/utils.py

@@ -7,6 +7,9 @@ from litellm.proxy.hooks.parallel_request_limiter import MaxParallelRequestsHand
 from litellm.proxy.hooks.max_budget_limiter import MaxBudgetLimiter
 from litellm.integrations.custom_logger import CustomLogger
 from fastapi import HTTPException, status
+import smtplib
+from email.mime.text import MIMEText
+from email.mime.multipart import MIMEMultipart
 
 
 def print_verbose(print_statement):
@@ -548,3 +551,42 @@ async def _cache_user_row(user_id: str, cache: DualCache, db: PrismaClient):
             key=cache_key, value=cache_value, ttl=600
         )  # store for 10 minutes
     return
+
+
+async def send_email(sender_name, sender_email, receiver_email, subject, html):
+    """
+    smtp_host,
+    smtp_port,
+    smtp_username,
+    smtp_password,
+    sender_name,
+    sender_email,
+    """
+    ## SERVER SETUP ##
+    smtp_host = os.getenv("SMTP_HOST")
+    smtp_port = os.getenv("SMTP_PORT", 587)  # default to port 587
+    smtp_username = os.getenv("SMTP_USERNAME")
+    smtp_password = os.getenv("SMTP_PASSWORD")
+    ## EMAIL SETUP ##
+    email_message = MIMEMultipart()
+    email_message["From"] = f"{sender_name} <{sender_email}>"
+    email_message["To"] = receiver_email
+    email_message["Subject"] = subject
+
+    # Attach the body to the email
+    email_message.attach(MIMEText(html, "html"))
+
+    try:
+        print_verbose(f"SMTP Connection Init")
+        # Establish a secure connection with the SMTP server
+        with smtplib.SMTP(smtp_host, smtp_port) as server:
+            server.starttls()
+
+            # Login to your email account
+            server.login(smtp_username, smtp_password)
+
+            # Send the email
+            server.send_message(email_message)
+
+    except Exception as e:
+        print_verbose("An error occurred while sending the email:", str(e))