Create app.py

app.py

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+import smtplib
+from email.mime.text import MIMEText
+from email.mime.multipart import MIMEMultipart
+import os
+from fastapi import FastAPI, HTTPException
+from pydantic import BaseModel, EmailStr
+
+# --- Configuration ---
+class SMTPSettings:
+    # Use os.getenv for all settings, with default values for non-sensitive ones
+    SMTP_HOST: str = os.getenv('SMTP_HOST', 'smtp.gmail.com')
+    SMTP_PORT: int = int(os.getenv('SMTP_PORT', 587))
+    SMTP_USER: str = os.getenv('SMTP_USER')
+    SMTP_PASS: str = os.getenv('SMTP_PASS')
+    RECIPIENT_EMAIL: str = os.getenv('RECIPIENT_EMAIL')
+    SENDER_NAME: str = os.getenv('SENDER_NAME', 'FastAPI Mailer')
+    SENDER_EMAIL: str = os.getenv('SENDER_EMAIL')
+
+    # Basic validation to ensure required fields are set
+    if not all([SMTP_USER, SMTP_PASS, RECIPIENT_EMAIL, SENDER_EMAIL]):
+        raise EnvironmentError("Missing one or more required environment variables: SMTP_USER, SMTP_PASS, RECIPIENT_EMAIL, SENDER_EMAIL")
+
+settings = SMTPSettings()
+
+# --- Pydantic Models ---
+class EmailRequest(BaseModel):
+    subject: str
+    body: str
+    recipient_email: EmailStr = settings.RECIPIENT_EMAIL # Default to the configured recipient
+
+# --- Email Utility Function ---
+def send_email(subject: str, body: str, recipient_email: str):
+    try:
+        # Create a multipart message and set headers
+        message = MIMEMultipart()
+        message['From'] = f"{settings.SENDER_NAME} <{settings.SENDER_EMAIL}>"
+        message['To'] = recipient_email
+        message['Subject'] = subject
+
+        # Add body to email
+        message.attach(MIMEText(body, 'plain'))
+
+        # Connect to the SMTP server
+        with smtplib.SMTP(settings.SMTP_HOST, settings.SMTP_PORT) as server:
+            server.starttls()  # Secure the connection
+            server.login(settings.SMTP_USER, settings.SMTP_PASS)
+            server.sendmail(settings.SENDER_EMAIL, recipient_email, message.as_string())
+        
+        return {"message": "Email sent successfully"}
+
+    except Exception as e:
+        print(f"Error sending email: {e}")
+        raise HTTPException(status_code=500, detail=f"Failed to send email: {e}")
+
+# --- FastAPI Application ---
+app = FastAPI(title="FastAPI SMTP Server")
+
+@app.get("/")
+def read_root():
+    return {"message": "FastAPI SMTP Server is running."}
+
+@app.post("/send-test-email")
+def send_test_email_endpoint():
+    subject = "FastAPI SMTP Test Email"
+    body = "This is a test email sent from the FastAPI server using the configured SMTP settings."
+    try:
+        send_email(subject, body, settings.RECIPIENT_EMAIL)
+        return {"status": "success", "message": f"Test email sent to {settings.RECIPIENT_EMAIL}"}
+    except HTTPException as e:
+        raise e
+
+@app.post("/send-email")
+def send_email_endpoint(email_request: EmailRequest):
+    try:
+        send_email(email_request.subject, email_request.body, email_request.recipient_email)
+        return {"status": "success", "message": f"Email sent to {email_request.recipient_email}"}
+    except HTTPException as e:
+        raise e
+
+if __name__ == "__main__":
+    import uvicorn
+    uvicorn.run(app, host="0.0.0.0", port=8000)