<h4>Centralized Email Module — Phase 1 & 2 Implementation</h4><h5>Phase 1: Foundation</h5><ul><li><strong>Created 5 database tables:</strong> email_config (40 site configs imported), email_templates_global (20 templates), email_templates_site (overrides), email_log (universal send log), email_quota_usage (per-site tracking)</li><li><strong>Created EmailService.php:</strong> Centralized singleton class with auto-sandbox detection for .lcl, per-site config loading (cascading: site → platform default → hardcoded), SendGrid sandbox mode injection, universal logging, quota management, template engine with placeholders, reporting methods</li><li><strong>Added environment detection:</strong> EMAIL_SANDBOX_MODE and EMAIL_DEV_ENVIRONMENT constants in define_common.php — auto-detects .lcl hostname</li></ul><h5>Phase 2: Core Migration</h5><ul><li><strong>Updated SendEmail class:</strong> All 8 send methods now delegate to EmailService.send() — sendInquiry, voteReceipt, reservationNotification, send_approval_email_notif, sendEmailVerificationCode, sendEmailForNewSignup, sendEmailValidated, sendEmailSubmitIndex, sendEmailUnIndex</li><li><strong>Updated Email class:</strong> All 10 send calls now delegate to EmailService.send()</li></ul><h5>Test Results</h5><ul><li>EmailService correctly detects .lcl → forces sandbox_mode=1</li><li>Config loaded from email_config table (site-specific with fallback)</li><li>Contact Us form → EmailService.send() → SendGrid API → 401 (expired key) → logged to email_log with siteid=1, sitelinkid=1, status=failed, sandbox_mode=1, module_name=Contact Us</li><li>All PHP syntax checks pass</li></ul><h5>Status</h5><p>When a valid SendGrid API key is provided, sandbox mode will return 200 OK and log status='sandbox'. No emails will be delivered on .lcl. On production domains, sandbox_mode will be 0 and emails will deliver normally.</p><p><strong>Files:</strong> classes/email/EmailService.php (NEW), classes/email/send_email.class.php, classes/email/email.class.php, controller/define_common.php</p>