`Centos7`下`mailx`默认已经安装，只需配置，即可使用 ~~~ #没有mailx可以使用这个安装 yum install mailx ~~~ 输出 ~~~ [root@iZ23w9ljtgdZ ~]# yum install mailx Loaded plugins: security base centos-sclo-rh centos-sclo-sclo epel epel/primary epel extras updates Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package mailx.x86_64 0:12.4-7.el6 will be updated ---> Package mailx.x86_64 0:12.4-8.el6_6 will be an update --> Finished Dependency Resolution Dependencies Resolved ========================================================= Package Arch Version Repository ========================================================= Updating: mailx x86_64 12.4-8.el6_6 base Transaction Summary ============================================= Upgrade 1 Package(s) Total download size: 235 k Is this ok [y/N]: y Downloading Packages: mailx-12.4-8.el6_6.x86_64.rpm Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Updating : mailx-12.4-8.el6_6.x86_64 Cleanup : mailx-12.4-7.el6.x86_64 Verifying : mailx-12.4-8.el6_6.x86_64 Verifying : mailx-12.4-7.el6.x86_64 Updated: mailx.x86_64 0:12.4-8.el6_6 Complete! ~~~