diff --git a/api/tests/manual/test_registration_api.py b/api/tests/manual/test_registration_api.py
new file mode 100644
index 0000000000..ba8d6cc3e9
--- /dev/null
+++ b/api/tests/manual/test_registration_api.py
@@ -0,0 +1,255 @@
+#!/usr/bin/env python3
+"""
+Manual test script for email registration API.
+Run this script to test the new registration flow with the server running on port 5001.
+"""
+
+import time
+from typing import Any
+
+import requests
+
+
+class RegistrationTester:
+    """Test class for registration API."""
+    
+    def __init__(self, base_url: str = "http://localhost:5001"):
+        self.base_url = base_url
+        self.session = requests.Session()
+        
+    def test_send_verification_code(self, email: str) -> dict[str, Any]:
+        """Test sending verification code."""
+        print(f"🔵 Testing verification code send for: {email}")
+        
+        response = self.session.post(
+            f"{self.base_url}/service/auth/email-code-login",
+            json={"email": email},
+            headers={"Content-Type": "application/json"}
+        )
+        
+        print(f"   Status: {response.status_code}")
+        print(f"   Response: {response.text}")
+        
+        return {
+            "status_code": response.status_code,
+            "response": (
+                response.json() 
+                if response.headers.get('content-type', '').startswith('application/json') 
+                else response.text
+            )
+        }
+    
+    def test_registration_with_code(self, email: str, code: str, token: str) -> dict[str, Any]:
+        """Test registration with verification code."""
+        print(f"🔵 Testing registration for: {email} with code: {code}")
+        
+        response = self.session.post(
+            f"{self.base_url}/service/auth/email-code-login/validity",
+            json={"email": email, "code": code, "token": token},
+            headers={"Content-Type": "application/json"}
+        )
+        
+        print(f"   Status: {response.status_code}")
+        print(f"   Response: {response.text}")
+        
+        return {
+            "status_code": response.status_code,
+            "response": (
+                response.json() 
+                if response.headers.get('content-type', '').startswith('application/json') 
+                else response.text
+            )
+        }
+    
+    def test_verification_code_sending(self, email: str) -> dict[str, Any]:
+        """Test verification code sending (first step only)."""
+        print(f"\n🚀 Testing verification code sending for: {email}")
+        print("=" * 50)
+        
+        # Step 1: Send verification code
+        send_result = self.test_send_verification_code(email)
+        
+        if send_result["status_code"] != 200:
+            print(f"❌ Failed to send verification code for {email}")
+            return send_result
+        
+        print(f"✅ Verification code sent successfully for {email}")
+        
+        # Extract token from send result
+        token = None
+        if isinstance(send_result["response"], dict) and "data" in send_result["response"]:
+            token = send_result["response"]["data"]
+            print(f"ℹ️  Received token: {token}")
+            print(f"ℹ️  A verification code has been sent to {email}")
+            print("ℹ️  To complete registration, user would enter the code from their email")
+        else:
+            print("❌ No token received from verification code send")
+            return {"status_code": 400, "response": "No token received"}
+        
+        return {"status_code": 200, "response": "Verification code sent successfully", "token": token}
+    
+    def test_registration_flow_interactive(self, email: str) -> dict[str, Any]:
+        """Test full registration flow with user input for verification code."""
+        print(f"\n🚀 Testing INTERACTIVE registration flow for: {email}")
+        print("=" * 50)
+        
+        # Step 1: Send verification code
+        send_result = self.test_send_verification_code(email)
+        
+        if send_result["status_code"] != 200:
+            print(f"❌ Failed to send verification code for {email}")
+            return send_result
+        
+        print(f"✅ Verification code sent successfully for {email}")
+        
+        # Extract token from send result
+        token = None
+        if isinstance(send_result["response"], dict) and "data" in send_result["response"]:
+            token = send_result["response"]["data"]
+            print(f"ℹ️  Received token: {token}")
+        else:
+            print("❌ No token received from verification code send")
+            return {"status_code": 400, "response": "No token received"}
+        
+        # Step 2: Get verification code from user
+        print(f"📧 A verification code has been sent to {email}")
+        verification_code = input("🔢 Please enter the verification code from your email: ").strip()
+        
+        if not verification_code:
+            print("❌ No verification code entered")
+            return {"status_code": 400, "response": "No verification code entered"}
+        
+        register_result = self.test_registration_with_code(email, verification_code, token)
+        
+        if register_result["status_code"] == 200:
+            print(f"✅ Registration successful for {email}")
+        else:
+            print(f"❌ Registration failed for {email}")
+        
+        return register_result
+    
+    def run_comprehensive_tests(self):
+        """Run comprehensive tests for different email scenarios."""
+        print("🧪 Running Comprehensive Email Verification Code Tests")
+        print("=" * 60)
+        print("ℹ️  This tests verification code sending (step 1 of registration)")
+        print("ℹ️  For full registration testing, use interactive mode")
+        
+        test_cases = [
+            {
+                "email": "student@university.edu",
+                "description": "University student (.edu domain)",
+                "expected_org": "Should be assigned to organization if domain match exists"
+            },
+            {
+                "email": "user@gmail.com",
+                "description": "Personal Gmail account",
+                "expected_org": "Should register without organization assignment"
+            },
+            {
+                "email": "employee@company.com",
+                "description": "Company email without pre-configured organization",
+                "expected_org": "Should register without organization assignment"
+            },
+            {
+                "email": "admin@startup.io",
+                "description": "Startup email",
+                "expected_org": "Should register without organization assignment"
+            },
+            {
+                "email": "test@protonmail.com",
+                "description": "ProtonMail account",
+                "expected_org": "Should register without organization assignment"
+            }
+        ]
+        
+        results = []
+        
+        for i, test_case in enumerate(test_cases, 1):
+            print(f"\n📋 Test Case {i}: {test_case['description']}")
+            print(f"   Email: {test_case['email']}")
+            print(f"   Expected: {test_case['expected_org']}")
+            
+            result = self.test_verification_code_sending(test_case["email"])
+            results.append({
+                "test_case": test_case,
+                "result": result
+            })
+            
+            # Small delay between tests
+            time.sleep(0.5)
+        
+        # Summary
+        print("\n📊 Test Results Summary")
+        print("=" * 30)
+        
+        for i, test_result in enumerate(results, 1):
+            test_case = test_result["test_case"]
+            result = test_result["result"]
+            
+            status = "✅ PASSED" if result["status_code"] == 200 else "❌ FAILED"
+            print(f"{i}. {test_case['description']}: {status}")
+            
+            if result["status_code"] != 200:
+                print(f"   Error: {result['response']}")
+        
+        # Overall summary
+        passed = sum(1 for r in results if r["result"]["status_code"] == 200)
+        total = len(results)
+        print(f"\n🎯 Overall: {passed}/{total} verification code tests passed")
+        
+        return results
+
+
+def main():
+    """Main function to run tests."""
+    print("🔍 Email Registration API Test Suite")
+    print("=" * 40)
+    
+    tester = RegistrationTester()
+    
+    # Check if server is running
+    try:
+        response = requests.get("http://localhost:5001/health", timeout=5)
+        print("✅ Server is running on port 5001")
+    except requests.exceptions.RequestException:
+        print("❌ Server is not running on port 5001")
+        print("   Please start the server with: uv run flask run --host 0.0.0.0 --port=5001 --debug")
+        return
+    
+    # Run comprehensive tests
+    results = tester.run_comprehensive_tests()
+    
+    # Additional specific tests
+    print("\n🔬 Additional Tests")
+    print("=" * 20)
+    
+    # Test invalid email
+    print("\n🔵 Testing invalid email format")
+    invalid_result = tester.test_send_verification_code("invalid.email")
+    if invalid_result["status_code"] != 200:
+        print("✅ Invalid email correctly rejected")
+    else:
+        print("❌ Invalid email was accepted (should be rejected)")
+    
+    # Test registration with invalid code
+    print("\n🔵 Testing registration with invalid code")
+    # First get a valid token
+    send_result = tester.test_send_verification_code("test@example.com")
+    if send_result["status_code"] == 200 and isinstance(send_result["response"], dict):
+        token = send_result["response"]["data"]
+        invalid_code_result = tester.test_registration_with_code("test@example.com", "wrong_code", token)
+        if invalid_code_result["status_code"] != 200:
+            print("✅ Invalid verification code correctly rejected")
+        else:
+            print("❌ Invalid verification code was accepted (should be rejected)")
+    else:
+        print("⚠️  Could not test invalid code - failed to get token")
+    
+    print("\n🎉 All tests completed!")
+    print("\nℹ️  Note: This test uses mock verification codes.")
+    print("   In production, users would receive actual codes via email.")
+
+
+if __name__ == "__main__":
+    main()
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