The connectivity log is a record of the Simple Mail Transfer Protocol (SMTP) connection activity of the outbound message delivery queues to the destination Mailbox server, smart host, or domain.

• 连接日志是发送至目标邮箱服务器、智能主机或域的出站邮件传递队列的简单邮件传输协议(SMTP)连接活动的记录。