本文档介绍了如何在Linux系统中解决无法发送邮件的问题，通过安装和配置mailx以及sendmail服务。首先，从Debian源下载并安装heirloom-mailx，应用补丁并进行编译安装。接着，设置mailx的发件人地址、SMTP服务器信息，并启用SMTP认证。然后，使用yum安装sendmail服务，并启动该服务。最后，通过发送测试邮件验证邮件发送功能是否正常。
安装mailx
cd /home/apps
wget http://ftp.debian.org/debian/pool/main/h/heirloom-mailx/heirloom-mailx_12.5.orig.tar.gz
wget http://www.linuxfromscratch.org/patches/blfs/7.9/heirloom-mailx-12.5-fixes-1.patch
tar zxvf heirloom-mailx_12.5.orig.tar.gz
给mailx打补丁，把heirloom-mailx-12.5-fixes-1.patch放在heirloom-mailx_12.5同级目录下
patch -p0 <heirloom-mailx-12.5-fixes-1.patch
cd heirloom-mailx_12.5
make
make install UCBINSTALL=/usr/bin/install
ln -s /home/apps/heirloom-mailx-12.5/mailx /bin/mail
[root@worker2 heirloom-mailx-12.5]# mail -V
12.5 6/20/10
在/etc/nail.rc最后添加两行：
set from=clg360Monitor@163.com smtp=smtp.163.com
set smtp-auth-user=clg360Mon smtp-auth-password=360cll smtp-auth=login
##clg360Monitor@163.com打开smtp,设置授权码为360cll
安装sendmail
yum install sendmail
启动sendmail
service sendmail start
测试是否能发送邮件：
cd /home/apps
wget http://ftp.debian.org/debian/pool/main/h/heirloom-mailx/heirloom-mailx_12.5.orig.tar.gz
wget http://www.linuxfromscratch.org/patches/blfs/7.9/heirloom-mailx-12.5-fixes-1.patch
tar zxvf heirloom-mailx_12.5.orig.tar.gz
给mailx打补丁，把heirloom-mailx-12.5-fixes-1.patch放在heirloom-mailx_12.5同级目录下
patch -p0 <heirloom-mailx-12.5-fixes-1.patch
cd heirloom-mailx_12.5
make
make install UCBINSTALL=/usr/bin/install
ln -s /home/apps/heirloom-mailx-12.5/mailx /bin/mail
[root@worker2 heirloom-mailx-12.5]# mail -V
12.5 6/20/10
在/etc/nail.rc最后添加两行：
set from=clg360Monitor@163.com smtp=smtp.163.com
set smtp-auth-user=clg360Mon smtp-auth-password=360cll smtp-auth=login
##clg360Monitor@163.com打开smtp,设置授权码为360cll
安装sendmail
yum install sendmail
启动sendmail
service sendmail start
测试是否能发送邮件：
echo 'Tset ' | mail -s "Test test" testmail@qq.com
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