feat(imap): 新邮件实时推送（IDLE）+ 后台当前连接监控
- IMAP 推送：imapBackend 实现 backend.BackendUpdater，SMTP 本地投递 与 Web 写信投递成功后 NotifyNewMessage，挂起 IDLE 的客户端即时收到 新邮件 FETCH 通知（按用户名+INBOX 过滤广播，通道满非阻塞丢弃） - 当前连接：新增 internal/connhub 连接注册中心，SMTP/IMAP/POP3 三协议 注册/注销/用户名/TLS/活跃时间追踪；后台新增「当前连接」页 （/admin/connections，统计卡片+连接表格，每 5 秒自动刷新） - 新增测试：connhub 并发安全、推送内容/非阻塞/nil 安全、 后台页面渲染；全量 -race 通过
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@@ -19,7 +19,8 @@
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<a href="/admin/mails" {{if eq .activeFolder "mails"}}class="active"{{end}}>所有邮件</a>
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<a href="/admin/outbound" {{if eq .activeFolder "outbound"}}class="active"{{end}}>外发队列</a>
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<a href="/admin/protocol-logs" {{if eq .activeFolder "protocol-logs"}}class="active"{{end}}>协议日志</a>
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<a href="/admin/bans" {{if eq .activeFolder "bans"}}class="active"{{end}}>IP黑名单</a>
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<a href="/admin/connections" {{if eq .activeFolder "connections"}}class="active"{{end}}>当前连接</a>
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<a href="/admin/bans" {{if eq .activeFolder "bans"}}class="active"{{end}}>IP黑名单</a>
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</div>
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<div class="content">
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<div class="card">
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@@ -0,0 +1,94 @@
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{{define "admin_connections"}}
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<!DOCTYPE html>
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<html lang="zh-CN">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover">
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<title>当前连接 - MailGo</title>
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<meta http-equiv="refresh" content="5">
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{{template "styles" .}}
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</head>
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<body>
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{{template "navbar" .}}
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<div class="container">
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<div class="clearfix">
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<div class="sidebar">
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<a href="/inbox">返回邮箱</a>
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<a href="/admin" {{if eq .activeFolder "admin"}}class="active"{{end}}>控制面板</a>
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<a href="/admin/domains" {{if eq .activeFolder "domains"}}class="active"{{end}}>域名管理</a>
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<a href="/admin/users" {{if eq .activeFolder "users"}}class="active"{{end}}>用户管理</a>
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<a href="/admin/mails" {{if eq .activeFolder "mails"}}class="active"{{end}}>所有邮件</a>
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<a href="/admin/outbound" {{if eq .activeFolder "outbound"}}class="active"{{end}}>外发队列</a>
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<a href="/admin/protocol-logs" {{if eq .activeFolder "protocol-logs"}}class="active"{{end}}>协议日志</a>
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<a href="/admin/connections" {{if eq .activeFolder "connections"}}class="active"{{end}}>当前连接</a>
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<a href="/admin/bans" {{if eq .activeFolder "bans"}}class="active"{{end}}>IP黑名单</a>
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</div>
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<div class="content">
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<div style="display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;">
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<h2>当前连接（SMTP / IMAP / POP3）</h2>
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<span style="color:#7f8c8d;font-size:13px;">每 5 秒自动刷新</span>
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</div>
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<div style="margin-bottom:24px;">
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<div class="stat-card">
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<h3>{{.total}}</h3>
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<p>当前连接总数</p>
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</div>
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<div class="stat-card">
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<h3>{{.smtpCount}}</h3>
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<p>SMTP</p>
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</div>
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<div class="stat-card">
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<h3>{{.imapCount}}</h3>
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<p>IMAP</p>
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</div>
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<div class="stat-card">
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<h3>{{.pop3Count}}</h3>
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<p>POP3</p>
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</div>
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</div>
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<div class="card">
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<table>
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<thead>
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<tr>
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<th>ID</th>
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<th>协议</th>
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<th>来源 IP</th>
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<th>端口</th>
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<th>用户名</th>
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<th>TLS</th>
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<th>连接时间</th>
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<th>时长</th>
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<th>最后活跃</th>
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</tr>
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</thead>
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<tbody>
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{{range .conns}}
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<tr>
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<td>{{.ID}}</td>
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<td>
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{{if eq .Protocol "smtp"}}<span class="badge" style="background:#3498db;color:#fff;">SMTP</span>
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{{else if eq .Protocol "imap"}}<span class="badge" style="background:#9b59b6;color:#fff;">IMAP</span>
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{{else}}<span class="badge" style="background:#16a085;color:#fff;">POP3</span>{{end}}
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</td>
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<td>{{.IP}}</td>
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<td>{{.Port}}</td>
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<td>{{if .User}}{{.User}}{{else}}—{{end}}</td>
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<td>{{if .TLS}}<span class="badge" style="background:#27ae60;color:#fff;">TLS</span>{{else}}<span class="badge" style="background:#95a5a6;color:#fff;">明文</span>{{end}}</td>
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<td>{{.Connected.Format "2006-01-02 15:04:05"}}</td>
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<td>{{durationSeconds ($.now.Sub .Connected)}}s</td>
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<td>{{.LastActive.Format "2006-01-02 15:04:05"}}</td>
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</tr>
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{{else}}
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<tr><td colspan="9" style="text-align:center;color:#7f8c8d;">当前没有活动连接</td></tr>
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{{end}}
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</tbody>
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</table>
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</div>
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</div>
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</div>
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</div>
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</body>
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</html>
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{{end}}
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@@ -19,6 +19,7 @@
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<a href="/admin/mails" {{if eq .activeFolder "mails"}}class="active"{{end}}>所有邮件</a>
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<a href="/admin/outbound" {{if eq .activeFolder "outbound"}}class="active"{{end}}>外发队列</a>
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<a href="/admin/protocol-logs" {{if eq .activeFolder "protocol-logs"}}class="active"{{end}}>协议日志</a>
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<a href="/admin/connections" {{if eq .activeFolder "connections"}}class="active"{{end}}>当前连接</a>
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<a href="/admin/bans" {{if eq .activeFolder "bans"}}class="active"{{end}}>IP黑名单</a>
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</div>
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<div class="content">
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@@ -19,6 +19,7 @@
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<a href="/admin/mails" {{if eq .activeFolder "mails"}}class="active"{{end}}>所有邮件</a>
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<a href="/admin/outbound" {{if eq .activeFolder "outbound"}}class="active"{{end}}>外发队列</a>
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<a href="/admin/protocol-logs" {{if eq .activeFolder "protocol-logs"}}class="active"{{end}}>协议日志</a>
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<a href="/admin/connections" {{if eq .activeFolder "connections"}}class="active"{{end}}>当前连接</a>
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<a href="/admin/bans" {{if eq .activeFolder "bans"}}class="active"{{end}}>IP黑名单</a>
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</div>
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<div class="content">
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@@ -19,6 +19,7 @@
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<a href="/admin/mails" {{if eq .activeFolder "mails"}}class="active"{{end}}>所有邮件</a>
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<a href="/admin/outbound" {{if eq .activeFolder "outbound"}}class="active"{{end}}>外发队列</a>
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<a href="/admin/protocol-logs" {{if eq .activeFolder "protocol-logs"}}class="active"{{end}}>协议日志</a>
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<a href="/admin/connections" {{if eq .activeFolder "connections"}}class="active"{{end}}>当前连接</a>
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<a href="/admin/bans" {{if eq .activeFolder "bans"}}class="active"{{end}}>IP黑名单</a>
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</div>
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<div class="content">
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@@ -19,6 +19,7 @@
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<a href="/admin/mails" {{if eq .activeFolder "mails"}}class="active"{{end}}>所有邮件</a>
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<a href="/admin/outbound" {{if eq .activeFolder "outbound"}}class="active"{{end}}>外发队列</a>
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<a href="/admin/protocol-logs" {{if eq .activeFolder "protocol-logs"}}class="active"{{end}}>协议日志</a>
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<a href="/admin/connections" {{if eq .activeFolder "connections"}}class="active"{{end}}>当前连接</a>
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<a href="/admin/bans" {{if eq .activeFolder "bans"}}class="active"{{end}}>IP黑名单</a>
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</div>
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<div class="content">
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@@ -28,6 +28,7 @@
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<a href="/admin/mails" class="active">所有邮件</a>
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<a href="/admin/outbound" {{if eq .activeFolder "outbound"}}class="active"{{end}}>外发队列</a>
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<a href="/admin/protocol-logs" {{if eq .activeFolder "protocol-logs"}}class="active"{{end}}>协议日志</a>
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<a href="/admin/connections" {{if eq .activeFolder "connections"}}class="active"{{end}}>当前连接</a>
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<a href="/admin/bans" {{if eq .activeFolder "bans"}}class="active"{{end}}>IP黑名单</a>
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</div>
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<div class="content">
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@@ -19,6 +19,7 @@
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<a href="/admin/mails" {{if eq .activeFolder "mails"}}class="active"{{end}}>所有邮件</a>
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<a href="/admin/outbound" {{if eq .activeFolder "outbound"}}class="active"{{end}}>外发队列</a>
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<a href="/admin/protocol-logs" {{if eq .activeFolder "protocol-logs"}}class="active"{{end}}>协议日志</a>
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<a href="/admin/connections" {{if eq .activeFolder "connections"}}class="active"{{end}}>当前连接</a>
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<a href="/admin/bans" {{if eq .activeFolder "bans"}}class="active"{{end}}>IP黑名单</a>
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</div>
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<div class="content">
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@@ -19,6 +19,7 @@
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<a href="/admin/mails" {{if eq .activeFolder "mails"}}class="active"{{end}}>所有邮件</a>
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<a href="/admin/outbound" {{if eq .activeFolder "outbound"}}class="active"{{end}}>外发队列</a>
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<a href="/admin/protocol-logs" {{if eq .activeFolder "protocol-logs"}}class="active"{{end}}>协议日志</a>
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<a href="/admin/connections" {{if eq .activeFolder "connections"}}class="active"{{end}}>当前连接</a>
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<a href="/admin/bans" {{if eq .activeFolder "bans"}}class="active"{{end}}>IP黑名单</a>
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</div>
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<div class="content">
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@@ -19,7 +19,8 @@
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<a href="/admin/mails" {{if eq .activeFolder "mails"}}class="active"{{end}}>所有邮件</a>
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<a href="/admin/outbound" {{if eq .activeFolder "outbound"}}class="active"{{end}}>外发队列</a>
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<a href="/admin/protocol-logs" {{if eq .activeFolder "protocol-logs"}}class="active"{{end}}>协议日志</a>
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<a href="/admin/bans" {{if eq .activeFolder "bans"}}class="active"{{end}}>IP黑名单</a>
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<a href="/admin/connections" {{if eq .activeFolder "connections"}}class="active"{{end}}>当前连接</a>
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<a href="/admin/bans" {{if eq .activeFolder "bans"}}class="active"{{end}}>IP黑名单</a>
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</div>
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<div class="content">
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<div style="display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;">
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@@ -19,6 +19,7 @@
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<a href="/admin/mails" {{if eq .activeFolder "mails"}}class="active"{{end}}>所有邮件</a>
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<a href="/admin/outbound" {{if eq .activeFolder "outbound"}}class="active"{{end}}>外发队列</a>
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<a href="/admin/protocol-logs" {{if eq .activeFolder "protocol-logs"}}class="active"{{end}}>协议日志</a>
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<a href="/admin/connections" {{if eq .activeFolder "connections"}}class="active"{{end}}>当前连接</a>
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<a href="/admin/bans" {{if eq .activeFolder "bans"}}class="active"{{end}}>IP黑名单</a>
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</div>
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<div class="content">
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@@ -19,6 +19,7 @@
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<a href="/admin/mails" {{if eq .activeFolder "mails"}}class="active"{{end}}>所有邮件</a>
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<a href="/admin/outbound" {{if eq .activeFolder "outbound"}}class="active"{{end}}>外发队列</a>
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<a href="/admin/protocol-logs" {{if eq .activeFolder "protocol-logs"}}class="active"{{end}}>协议日志</a>
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<a href="/admin/connections" {{if eq .activeFolder "connections"}}class="active"{{end}}>当前连接</a>
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<a href="/admin/bans" {{if eq .activeFolder "bans"}}class="active"{{end}}>IP黑名单</a>
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</div>
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<div class="content">
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