security: sanitize internal infrastructure details from open source package

- Remove production_test_sequence.sh (DAW-specific production tests)
- Remove setup_env.sh (obsolete .env setup, replaced by furt.conf)
- Sanitize test scripts: replace dragons-at-work.de with example.com
- Sanitize API keys: replace dev keys with placeholder values
- Remove hardcoded DAW fallbacks from http_server.lua and smtp.lua
- Update .gitignore to exclude production-specific test files

Tests remain functional for developers with example domains.
All internal DAW infrastructure details removed from package.

Closes #101

.gitignore

@@ -68,3 +68,4 @@ config.production.lua
 
 config/furt.conf
 
+scripts/production_test_sequence.sh

scripts/manual_mail_test.sh

@@ -4,11 +4,11 @@
 echo "Testing SMTP with corrected JSON..."
 
 # Simple test without timestamp embedding
-curl -X POST http://127.0.0.1:8080/v1/mail/send \
+curl -X POST http://127.0.0.1:7811/v1/mail/send \
      -H "Content-Type: application/json" \
      -d '{
        "name": "Furt Test User",
-       "email": "michael@dragons-at-work.de",
+       "email": "admin@example.com",
        "subject": "Furt SMTP Test Success!",
        "message": "This is a test email from Furt Lua HTTP-Server. SMTP Integration working!"
      }'

scripts/production_test_sequence.sh

@@ -1,80 +0,0 @@
-#!/bin/bash
-# Production Test für api.dragons-at-work.de
-
-echo "Testing Production API via Apache Proxy"
-echo "======================================="
-
-# Test 1: HTTPS Health Check
-echo ""
-echo "[1] Testing HTTPS Health Check..."
-https_health=$(curl -s https://api.dragons-at-work.de/health)
-echo "HTTPS Response: $https_health"
-
-if echo "$https_health" | grep -q "healthy"; then
-    echo "[OK] HTTPS Proxy working"
-else
-    echo "[ERROR] HTTPS Proxy failed"
-    exit 1
-fi
-
-# Test 2: SMTP Status via HTTPS
-echo ""
-echo "[2] Testing SMTP Configuration via HTTPS..."
-if echo "$https_health" | grep -q '"smtp_configured":true'; then
-    echo "[OK] SMTP configured and accessible via HTTPS"
-else
-    echo "[ERROR] SMTP not configured or not accessible"
-fi
-
-# Test 3: CORS Headers
-echo ""
-echo "[3] Testing CORS Headers..."
-cors_test=$(curl -s -I https://api.dragons-at-work.de/health | grep -i "access-control")
-if [ -n "$cors_test" ]; then
-    echo "[OK] CORS headers present: $cors_test"
-else
-    echo "[WARN] CORS headers missing - add to Apache config"
-fi
-
-# Test 4: Production Mail Test  
-echo ""
-echo "[4] Testing Production Mail via HTTPS..."
-echo "WARNING: This sends real email via production API"
-read -p "Continue with production mail test? (y/N): " -n 1 -r
-echo
-
-if [[ $REPLY =~ ^[Yy]$ ]]; then
-    echo "Sending production test email..."
-    
-    prod_mail_response=$(curl -s -X POST https://api.dragons-at-work.de/v1/mail/send \
-        -H "Content-Type: application/json" \
-        -d '{
-            "name": "Production Test",
-            "email": "test@dragons-at-work.de",
-            "subject": "Production API Test - Apache Proxy Success!",
-            "message": "This email was sent via the production API at api.dragons-at-work.de through Apache proxy to Furt-Lua backend. HTTPS integration working!"
-        }')
-    
-    echo "Production Response: $prod_mail_response"
-    
-    if echo "$prod_mail_response" | grep -q '"success":true'; then
-        echo "[OK] PRODUCTION MAIL SENT VIA HTTPS!"
-        echo "Check admin@dragons-at-work.de for delivery confirmation"
-    else
-        echo "[ERROR] Production mail failed"
-    fi
-else
-    echo "Skipping production mail test"
-fi
-
-# Test 5: Security Headers
-echo ""
-echo "[5] Testing Security Headers..."
-security_headers=$(curl -s -I https://api.dragons-at-work.de/health)
-echo "Security Headers:"
-echo "$security_headers" | grep -i "x-content-type-options\|x-frame-options\|strict-transport"
-
-echo ""
-echo "Production Test Complete!"
-echo "========================"
-echo "Next: Hugo integration with https://api.dragons-at-work.de/v1/mail/send"

scripts/setup_env.sh

@@ -1,101 +0,0 @@
-#!/bin/bash
-# furt-lua/scripts/setup_env.sh
-# Add SMTP environment variables to existing .env (non-destructive)
-
-set -e
-
-# Colors for output
-GREEN='\033[0;32m'
-YELLOW='\033[1;33m'
-RED='\033[0;31m'
-NC='\033[0m' # No Color
-
-echo -e "${GREEN}=== Furt SMTP Environment Setup ===${NC}"
-
-# Navigate to furt project root
-SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-PROJECT_ROOT="$(dirname "$(dirname "$SCRIPT_DIR")")"
-ENV_FILE="$PROJECT_ROOT/.env"
-
-echo -e "${YELLOW}Project root:${NC} $PROJECT_ROOT"
-echo -e "${YELLOW}Environment file:${NC} $ENV_FILE"
-
-# Check if .env exists
-if [ ! -f "$ENV_FILE" ]; then
-    echo -e "${YELLOW}Creating new .env file...${NC}"
-    cat > "$ENV_FILE" << 'EOF'
-# Dragons@Work Project Environment Variables
-
-# Furt SMTP Configuration for mail.dragons-at-work.de
-SMTP_HOST="mail.dragons-at-work.de"
-SMTP_PORT="465"
-SMTP_USERNAME="your_email@dragons-at-work.de"
-SMTP_PASSWORD="your_smtp_password"
-SMTP_FROM="noreply@dragons-at-work.de"
-SMTP_TO="michael@dragons-at-work.de"
-EOF
-    echo -e "${GREEN}[OK] Created new .env file${NC}"
-    echo -e "${YELLOW}[EDIT] Please edit:${NC} nano $ENV_FILE"
-    exit 0
-fi
-
-echo -e "${GREEN}[OK] Found existing .env file${NC}"
-
-# Check if SMTP variables already exist
-smtp_username_exists=$(grep -c "^SMTP_USERNAME=" "$ENV_FILE" 2>/dev/null || echo "0")
-smtp_password_exists=$(grep -c "^SMTP_PASSWORD=" "$ENV_FILE" 2>/dev/null || echo "0")
-
-if [ "$smtp_username_exists" -gt 0 ] && [ "$smtp_password_exists" -gt 0 ]; then
-    echo -e "${GREEN}[OK] SMTP variables already configured${NC}"
-    
-    # Load and show current values
-    source "$ENV_FILE"
-    echo -e "${YELLOW}Current SMTP User:${NC} ${SMTP_USERNAME:-NOT_SET}"
-    echo -e "${YELLOW}Current SMTP Password:${NC} ${SMTP_PASSWORD:+[CONFIGURED]}${SMTP_PASSWORD:-NOT_SET}"
-    
-    echo ""
-    echo -e "${YELLOW}To update SMTP settings:${NC} nano $ENV_FILE"
-    exit 0
-fi
-
-# Add missing SMTP variables
-echo -e "${YELLOW}Adding SMTP configuration to existing .env...${NC}"
-
-# Add section header if not present
-if ! grep -q "SMTP_" "$ENV_FILE" 2>/dev/null; then
-    echo "" >> "$ENV_FILE"
-    echo "# Furt SMTP Configuration for mail.dragons-at-work.de" >> "$ENV_FILE"
-fi
-
-# Add username if missing
-if [ "$smtp_username_exists" -eq 0 ]; then
-    echo "SMTP_HOST=\"mail.dragons-at-work.de\"" >> "$ENV_FILE"
-    echo "SMTP_PORT=\"465\"" >> "$ENV_FILE"
-    echo "SMTP_USERNAME=\"your_email@dragons-at-work.de\"" >> "$ENV_FILE"
-    echo -e "${GREEN}[OK] Added SMTP_HOST, SMTP_PORT, SMTP_USERNAME${NC}"
-fi
-
-# Add password if missing
-if [ "$smtp_password_exists" -eq 0 ]; then
-    echo "SMTP_PASSWORD=\"your_smtp_password\"" >> "$ENV_FILE"
-    echo "SMTP_FROM=\"noreply@dragons-at-work.de\"" >> "$ENV_FILE"
-    echo "SMTP_TO=\"michael@dragons-at-work.de\"" >> "$ENV_FILE"
-    echo -e "${GREEN}[OK] Added SMTP_PASSWORD, SMTP_FROM, SMTP_TO${NC}"
-fi
-
-echo -e "${GREEN}[OK] SMTP configuration added to .env${NC}"
-echo ""
-echo -e "${YELLOW}Next steps:${NC}"
-echo "1. Edit SMTP credentials: nano $ENV_FILE"
-echo "2. Set your actual email@dragons-at-work.de in SMTP_USERNAME"
-echo "3. Set your actual SMTP password in SMTP_PASSWORD"
-echo "4. Test with: ./scripts/start.sh"
-
-echo ""
-echo -e "${YELLOW}Current .env content:${NC}"
-echo "==================="
-cat "$ENV_FILE"
-echo "==================="
-echo ""
-echo -e "${GREEN}Ready for SMTP testing!${NC}"
-

scripts/stress_test.sh

@@ -4,7 +4,7 @@
 
 BASE_URL="http://127.0.0.1:8080"
 # Use correct API keys that match current .env
-API_KEY="hugo-dev-key-change-in-production"
+API_KEY="YOUR_API_KEY_HERE"
 
 echo "⚡ Furt API Stress Test"
 echo "======================"
@@ -20,9 +20,9 @@ for i in {1..20}; do
     response=$(curl -s -w "%{http_code}" \
         -H "X-API-Key: $API_KEY" \
         "$BASE_URL/v1/auth/status")
-    
+
     status=$(echo "$response" | tail -c 4)
-    
+
     if [ "$status" == "200" ]; then
         rate_limit_remaining=$(echo "$response" | head -n -1 | jq -r '.rate_limit_remaining // "N/A"' 2>/dev/null)
         echo "Request $i: ✅ 200 OK (Rate limit remaining: $rate_limit_remaining)"
@@ -33,7 +33,7 @@ for i in {1..20}; do
     else
         echo "Request $i: ❌ $status Error"
     fi
-    
+
     # Small delay to prevent overwhelming
     sleep 0.1
 done
@@ -58,10 +58,10 @@ for i in {1..10}; do
             -H "X-API-Key: $API_KEY" \
             "$BASE_URL/health")
         local_end=$(date +%s.%N)
-        
+
         status=$(echo "$response" | tail -c 4)
         duration=$(echo "$local_end - $local_start" | bc -l)
-        
+
         echo "Concurrent $i: Status $status, Duration ${duration}s" > "$temp_dir/result_$i"
     } &
 done
@@ -85,18 +85,18 @@ mail_errors=0
 
 for i in {1..5}; do
     start_time=$(date +%s.%N)
-    
+
     response=$(curl -s -w "%{http_code}" \
         -H "X-API-Key: $API_KEY" \
         -H "Content-Type: application/json" \
         -d "{\"name\":\"Stress Test $i\",\"email\":\"test$i@example.com\",\"subject\":\"Performance Test\",\"message\":\"Load test message $i\"}" \
         "$BASE_URL/v1/mail/send")
-    
+
     end_time=$(date +%s.%N)
     duration=$(echo "$end_time - $start_time" | bc -l)
-    
+
     status=$(echo "$response" | tail -c 4)
-    
+
     if [ "$status" == "200" ]; then
         echo "Mail $i: ✅ 200 OK (${duration}s)"
         ((mail_success++))
@@ -104,7 +104,7 @@ for i in {1..5}; do
         echo "Mail $i: ❌ Status $status (${duration}s)"
         ((mail_errors++))
     fi
-    
+
     # Delay between mail sends to be nice to SMTP server
     sleep 1
 done
@@ -120,7 +120,7 @@ mixed_success=0
 
 for i in {1..15}; do
     ((mixed_total++))
-    
+
     if [ $((i % 3)) -eq 0 ]; then
         # Every 3rd request: auth status
         endpoint="/v1/auth/status"
@@ -128,20 +128,20 @@ for i in {1..15}; do
         # Other requests: health check
         endpoint="/health"
     fi
-    
+
     response=$(curl -s -w "%{http_code}" \
         -H "X-API-Key: $API_KEY" \
         "$BASE_URL$endpoint")
-    
+
     status=$(echo "$response" | tail -c 4)
-    
+
     if [ "$status" == "200" ]; then
         echo "Mixed $i ($endpoint): ✅ 200 OK"
         ((mixed_success++))
     else
         echo "Mixed $i ($endpoint): ❌ $status"
     fi
-    
+
     sleep 0.2
 done
 

scripts/test_auth.sh

@@ -3,8 +3,8 @@
 # Test API-Key-Authentifizierung (ohne jq parse errors)
 
 BASE_URL="http://127.0.0.1:8080"
-HUGO_API_KEY="hugo-dev-key-change-in-production"
-ADMIN_API_KEY="admin-dev-key-change-in-production"
+HUGO_API_KEY="YOUR_API_KEY_HERE"
+ADMIN_API_KEY="YOUR_ADMIN_KEY_HERE"
 INVALID_API_KEY="invalid-key-should-fail"
 
 echo "🔐 Testing Furt API-Key Authentication"
@@ -16,24 +16,24 @@ make_request() {
     local url="$2"
     local headers="$3"
     local data="$4"
-    
+
     echo "Request: $method $url"
     if [ -n "$headers" ]; then
         echo "Headers: $headers"
     fi
-    
+
     local response=$(curl -s $method \
         ${headers:+-H "$headers"} \
         ${data:+-d "$data"} \
         -H "Content-Type: application/json" \
         "$url")
-    
+
     local status=$(curl -s -o /dev/null -w "%{http_code}" $method \
         ${headers:+-H "$headers"} \
         ${data:+-d "$data"} \
         -H "Content-Type: application/json" \
         "$url")
-    
+
     echo "Status: $status"
     echo "Response: $response" | jq '.' 2>/dev/null || echo "$response"
     echo ""

scripts/test_modular.sh

@@ -3,7 +3,7 @@
 # Test der modularen Furt-Architektur
 
 BASE_URL="http://127.0.0.1:8080"
-HUGO_API_KEY="hugo-dev-key-change-in-production"
+HUGO_API_KEY="YOUR_API_KEY_HERE"
 
 echo "🧩 Testing Modular Furt Architecture"
 echo "===================================="

scripts/test_smtp.sh

@@ -36,7 +36,7 @@ else
     echo "[ERROR] Validation failed"
 fi
 
-# Test 3: Invalid Email Format  
+# Test 3: Invalid Email Format
 echo ""
 echo "[3] Testing email validation..."
 email_validation_response=$(curl -s -X POST "$SERVER_URL/v1/mail/send" \
@@ -54,36 +54,36 @@ fi
 # Test 4: Valid Mail Request (REAL SMTP TEST)
 echo ""
 echo "[4] Testing REAL mail sending..."
-echo "WARNING: This will send a real email to michael@dragons-at-work.de"
+echo "WARNING: This will send a real email to admin@example.com"
 read -p "Continue with real mail test? (y/N): " -n 1 -r
 echo
 
 if [[ $REPLY =~ ^[Yy]$ ]]; then
     echo "Sending real test email..."
-    
+
     mail_response=$(curl -s -X POST "$SERVER_URL/v1/mail/send" \
         -H "Content-Type: application/json" \
         -d '{
             "name": "Furt Test User",
-            "email": "test@dragons-at-work.de", 
+            "email": "test@example.com",
             "subject": "Furt SMTP Test - Week 2 Success!",
             "message": "This is a test email from the Furt Lua HTTP-Server.\n\nSMTP Integration is working!\n\nTimestamp: '$(date)'\nServer: furt-lua v1.0"
         }')
-    
+
     echo "Response: $mail_response"
-    
+
     # Check for success
     if echo "$mail_response" | grep -q '"success":true'; then
         echo "[OK] MAIL SENT SUCCESSFULLY!"
-        echo "Check michael@dragons-at-work.de inbox"
-        
+        echo "Check admin@example.com inbox"
+
         # Extract request ID
         request_id=$(echo "$mail_response" | grep -o '"request_id":"[^"]*"' | cut -d'"' -f4)
         echo "Request ID: $request_id"
     else
         echo "[ERROR] Mail sending failed"
         echo "Check server logs and SMTP credentials"
-        
+
         # Show error details
         if echo "$mail_response" | grep -q "error"; then
             error_msg=$(echo "$mail_response" | grep -o '"error":"[^"]*"' | cut -d'"' -f4)
@@ -126,7 +126,7 @@ echo "Performance: ${duration_ms}ms"
 echo ""
 echo "Week 2 Challenge Status:"
 echo "  SMTP Integration: COMPLETE"
-echo "  Environment Variables: CHECK .env" 
+echo "  Environment Variables: CHECK .env"
 echo "  Native Lua Implementation: DONE"
 echo "  Production Ready: READY FOR TESTING"
 

src/http_server.lua

@@ -91,9 +91,7 @@ end
 function FurtServer:add_cors_headers(request)
     local allowed_origins = config.cors and config.cors.allowed_origins or {
         "http://localhost:1313",
-        "http://127.0.0.1:1313",
-        "https://dragons-at-work.de",
-        "https://www.dragons-at-work.de"
+        "http://127.0.0.1:1313"
     }
 
     -- Check if request has Origin header

src/smtp.lua

@@ -19,7 +19,7 @@ function SSLCompat:detect_ssl_library()
             return "luaossl", ssl_lib
         end
     end
-    
+
     -- Try luasec
     local success, ssl_lib = pcall(require, "ssl")
     if success and ssl_lib then
@@ -28,23 +28,23 @@ function SSLCompat:detect_ssl_library()
             return "luasec", ssl_lib
         end
     end
-    
+
     return nil, "No compatible SSL library found (tried luaossl, luasec)"
 end
 
 function SSLCompat:wrap_socket(sock, options)
     local ssl_type, ssl_lib = self:detect_ssl_library()
-    
+
     if not ssl_type then
         return nil, ssl_lib  -- ssl_lib contains error message
     end
-    
+
     if ssl_type == "luaossl" then
         return self:wrap_luaossl(sock, options, ssl_lib)
     elseif ssl_type == "luasec" then
         return self:wrap_luasec(sock, options, ssl_lib)
     end
-    
+
     return nil, "Unknown SSL library type: " .. ssl_type
 end
 
@@ -55,18 +55,18 @@ function SSLCompat:wrap_luaossl(sock, options, ssl_lib)
         protocol = "tlsv1_2",
         verify = "none"  -- For self-signed certs
     })
-    
+
     if not ssl_sock then
         return nil, "luaossl wrap failed: " .. (err or "unknown error")
     end
-    
+
     -- luaossl typically does handshake automatically, but explicit is safer
     local success, err = pcall(function() return ssl_sock:dohandshake() end)
     if not success then
         -- Some luaossl versions don't need explicit handshake
         -- Continue if dohandshake doesn't exist
     end
-    
+
     return ssl_sock, nil
 end
 
@@ -78,28 +78,28 @@ function SSLCompat:wrap_luasec(sock, options, ssl_lib)
         verify = "none",
         options = "all"
     })
-    
+
     if not ssl_sock then
         return nil, "luasec wrap failed: " .. (err or "unknown error")
     end
-    
+
     -- luasec requires explicit handshake
     local success, err = ssl_sock:dohandshake()
     if not success then
         return nil, "luasec handshake failed: " .. (err or "unknown error")
     end
-    
+
     return ssl_sock, nil
 end
 
 -- Create SMTP instance
 function SMTP:new(config)
     local instance = {
-        server = config.smtp_server or "mail.dragons-at-work.de",
-        port = config.smtp_port or 465,
+        server = config.smtp_server,
+        port = config.smtp_port,
         username = config.username,
         password = config.password,
-        from_address = config.from_address or "noreply@dragons-at-work.de",
+        from_address = config.from_address,
         use_ssl = config.use_ssl or true,
         debug = config.debug or false,
         ssl_compat = SSLCompat
@@ -133,7 +133,7 @@ function SMTP:send_command(sock, command, expected_code)
     if self.debug then
         print("SMTP CMD: " .. (command or ""):gsub("\r\n", "\\r\\n"))
     end
-    
+
     -- Only send if command is not nil (for server greeting, command is nil)
     if command then
         local success, err = sock:send(command .. "\r\n")
@@ -141,16 +141,16 @@ function SMTP:send_command(sock, command, expected_code)
             return false, "Failed to send command: " .. (err or "unknown error")
         end
     end
-    
+
     local response, err = sock:receive()
     if not response then
         return false, "Failed to receive response: " .. (err or "unknown error")
     end
-    
+
     if self.debug then
         print("SMTP RSP: " .. response)
     end
-    
+
     -- Handle multi-line responses (like EHLO)
     local full_response = response
     while response:match("^%d%d%d%-") do
@@ -163,12 +163,12 @@ function SMTP:send_command(sock, command, expected_code)
         end
         full_response = full_response .. "\n" .. response
     end
-    
+
     local code = response:match("^(%d+)")
     if expected_code and code ~= tostring(expected_code) then
         return false, "Unexpected response: " .. full_response
     end
-    
+
     return true, full_response
 end
 
@@ -179,38 +179,38 @@ function SMTP:connect()
     if not sock then
         return false, "Failed to create socket: " .. (err or "unknown error")
     end
-    
+
     -- Set timeout
     sock:settimeout(30)
-    
+
     -- Connect to server
     local success, err = sock:connect(self.server, self.port)
     if not success then
         return false, "Failed to connect to " .. self.server .. ":" .. self.port .. " - " .. (err or "unknown error")
     end
-    
+
     -- Wrap with SSL for port 465 using compatibility layer
     if self.use_ssl and self.port == 465 then
         local ssl_sock, err = self.ssl_compat:wrap_socket(sock, {
             mode = "client",
             protocol = "tlsv1_2"
         })
-        
+
         if not ssl_sock then
             sock:close()
             return false, "Failed to establish SSL connection: " .. (err or "unknown error")
         end
-        
+
         sock = ssl_sock
     end
-    
+
     -- Read server greeting
     local success, response = self:send_command(sock, nil, 220)
     if not success then
         sock:close()
         return false, "SMTP server greeting failed: " .. response
     end
-    
+
     return sock, nil
 end
 
@@ -219,64 +219,64 @@ function SMTP:send_email(to_address, subject, message, from_name)
     if not self.username or not self.password then
         return false, "SMTP username or password not configured"
     end
-    
+
     -- Connect to server
     local sock, err = self:connect()
     if not sock then
         return false, err
     end
-    
+
     local function cleanup_and_fail(error_msg)
         sock:close()
         return false, error_msg
     end
-    
+
     -- EHLO command
     local success, response = self:send_command(sock, "EHLO furt-lua", 250)
     if not success then
         return cleanup_and_fail("EHLO failed: " .. response)
     end
-    
+
     -- AUTH LOGIN
     local success, response = self:send_command(sock, "AUTH LOGIN", 334)
     if not success then
         return cleanup_and_fail("AUTH LOGIN failed: " .. response)
     end
-    
+
     -- Send username (base64 encoded)
     local username_b64 = self:base64_encode(self.username)
     local success, response = self:send_command(sock, username_b64, 334)
     if not success then
         return cleanup_and_fail("Username authentication failed: " .. response)
     end
-    
+
     -- Send password (base64 encoded)
     local password_b64 = self:base64_encode(self.password)
     local success, response = self:send_command(sock, password_b64, 235)
     if not success then
         return cleanup_and_fail("Password authentication failed: " .. response)
     end
-    
+
     -- MAIL FROM
     local mail_from = "MAIL FROM:<" .. self.from_address .. ">"
     local success, response = self:send_command(sock, mail_from, 250)
     if not success then
         return cleanup_and_fail("MAIL FROM failed: " .. response)
     end
-    
+
     -- RCPT TO
     local rcpt_to = "RCPT TO:<" .. to_address .. ">"
     local success, response = self:send_command(sock, rcpt_to, 250)
     if not success then
         return cleanup_and_fail("RCPT TO failed: " .. response)
     end
-    
+
     -- DATA command
     local success, response = self:send_command(sock, "DATA", 354)
     if not success then
         return cleanup_and_fail("DATA command failed: " .. response)
     end
-    
+
     -- Build email message
     local display_name = from_name or "Furt Contact Form"
     local email_content = string.format(
@@ -295,17 +295,17 @@ function SMTP:send_email(to_address, subject, message, from_name)
         os.date("%a, %d %b %Y %H:%M:%S %z"),
         message
     )
-    
+
     -- Send email content
     local success, response = self:send_command(sock, email_content, 250)
     if not success then
         return cleanup_and_fail("Email sending failed: " .. response)
     end
-    
+
     -- QUIT
     self:send_command(sock, "QUIT", 221)
     sock:close()
-    
+
     return true, "Email sent successfully"
 end