我运行一个私人邮件服务器,但是它被试图访问外发服务器 smtp 端口的非关联邮件客户端发现。为什么会发生这种情况?这是怎么发生的?是不是黑客寻找正在监听这些端口的机器并尝试连接?
Jul 10 09:28:12 mail postfix/submission/smtpd[3382116]: connect from unknown[xxx.2.163.231]
Jul 10 09:28:22 mail postfix/submission/smtpd[3382116]: SSL_accept error from unknown[xxx.2.163.231]: lost connection
Jul 10 09:28:22 mail postfix/submission/smtpd[3382116]: lost connection after CONNECT from unknown[xxx.2.163.231]
Jul 10 09:28:22 mail postfix/submission/smtpd[3382116]: disconnect from unknown[xxx.2.163.231] commands=0/0