使用sendmail实用程序时出现的问题
[root@]# /etc/init.d/sendmail status
sendmail (pid 84609) is running...
sm-client (pid 84622) is running...
[root@]# echo "Subject: hello" | sendmail -v someone@gmail.com
someone@gmail.com... Connecting to [127.0.0.1] via relay...
someone@gmail.com... Deferred: Connection refused by [127.0.0.1]
[root@]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 6.10 (Santiago)
当我启动telnet命令时，它显示在下面的输出中。
[root@opc]# telnet localhost 25
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused
Trying ::1...