<h4>Phase 4: Admin UI — Complete</h4><h5>Platform Admin (<code>/platform/administration/services/email/?page=management</code>)</h5><ul><li><strong>Dashboard tab:</strong> Today/month email stats, per-site usage table, recent failures list, sandbox mode indicator</li><li><strong>Sites tab:</strong> All 40 site configs with usage counts, edit modal for from/reply-to/CC/BCC/quota/sandbox</li><li><strong>Templates tab:</strong> All 20 global templates with code/name/category/subject/active status</li><li><strong>Logs tab:</strong> Paginated email log with filters (status, date range), shows site/to/subject/module/status/code</li><li><strong>Settings tab:</strong> API key test button, sandbox test email sender</li></ul><h5>Tenant Admin (<code>/platform/settings/emails/?page=settings</code>)</h5><ul><li><strong>Settings tab:</strong> Edit this site's from email, from name, reply-to, CC, BCC. Shows sandbox status.</li><li><strong>Log tab:</strong> This site's email history with status/date filters</li><li><strong>Usage tab:</strong> Total/sent/failed/sandbox counters + daily breakdown table</li><li><strong>Templates tab:</strong> Shows all 20 templates with Default/Custom override status</li><li><strong>Test tab:</strong> Send test email with sandbox indicator</li></ul><h5>Files Created:</h5><ul><li><code>platform/administration/services/email/pages/email_management.php</code> (Platform Admin UI)</li><li><code>platform/settings/emails/email_settings.php</code> (Tenant Admin UI)</li><li>Updated <code>pagedata.php</code> in both directories</li><li>Updated <code>select_email.php</code> with Email Management link</li></ul><p><strong>Both pages verified:</strong> 0 PHP errors, all tabs render, all AJAX endpoints connected.</p>