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mailx安装我就不介绍了，很简单！我先介绍下系统的版本和mailx的版本
[root@localhost ~]# mailx -V
12.4 7/29/08
[root@localhost ~]# cat /etc/issue
CentOS release 6.8 (Final)
Kernel \r on an \m
mailx的配置文件在/etc/mail.rc（我是rpm安装的）
在配置文件中添加下面的代码（passwd写开通smtp客户端给的授权码）
set from=usernam@163.com
set smtp=smtp.163.com
set smtp-auth-user=username@163.com
set smtp-auth-password=passwd
set smtp-auth=login
测试下是否可以使用
cat /opt/tesh |mailx -v -s 'hello' '*****@163.com'
测试发现有时能发送，有时会退信并报以下错误：
554 DT:SPM 163 smtp3,DdGowACX1p2fRn9X_lIIAA--.2018S2 1467958944,please see http://mail.163.com/help/help_spam_16.htm?ip=*.*.*.*&hostid=smtp3&time=1467958944
smtp-server: 554 DT:SPM 163 smtp3,DdGowACX1p2fRn9X_lIIAA--.2018S2 1467958944,please see http://mail.163.com/help/help_spam_16.htm?ip=*.*.*.*&hostid=smtp3&time=1467958944
"/root/dead.letter" 0/0
. . . message not sent.
554 DT:SPM 发送的邮件内容包含了未被许可的信息，或被系统识别为垃圾邮件。请检查是否有用户发送病毒或者垃圾邮件
查了下原因，因为163反垃圾邮件设置的原因，所有我采用了qq邮箱及hostmail
qq邮箱
set from=224******53@qq.com
set smtp=smtp.qq.com
set smtp-auth-user=224******53@qq.com
set smtp-auth-password=euia********chb #授权码
set smtp-auth=login
错误提示：
530 Error: A secure connection is requiered(such as ssl). More information at http://service.mail.qq.com/cgi-bin/help?id=28
smtp-server: 530 Error: A secure connection is requiered(such as ssl). More information at http://service.mail.qq.com/cgi-bin/help?id=28
"/root/dead.letter" 19/438
. . . message not sent
于是我改了下配置文件添加了几个参数
set from=224******53@qq.com
set smtp=smtp.qq.com
set smtp-auth-user=224******53@qq.com
set smtp-auth-password=euia********chb
set smtp-auth=login
set smtp-use-starttls
set ssl-verify=ignore
set nss-config-dir=/etc/pki/nssdb/
邮件发送成功，在/etc/pki/nssdb/有证书文件
当然还有两个方式可以获取证书文件
mkdir -p /root/.certs/
echo -n | openssl s_client -connect smtp.qq.com:465 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > ~/.certs/qq.crt
certutil -A -n "GeoTrust SSL CA" -t "C,," -d ~/.certs -i ~/.certs/qq.crt
certutil -A -n "GeoTrust Global CA" -t "C,," -d ~/.certs -i ~/.certs/qq.crt
certutil -L -d /root/.certs
然后mail.rc的配置文件改成
set from=224******53@qq.com
set smtp=smtp.qq.com
set smtp-auth-user=224******53@qq.com
set smtp-auth-password=euia********chb
set smtp-auth=login
set smtp-use-starttls
set ssl-verify=ignore
set nss-config-dir=/root/.certs
有些邮箱无法通过上述方式获取证书，我们可以在装有火狐浏览器的服务器中把证书拷贝过来
[root@localhost test]# cd /home/test/.mozilla/firefox/twmiqm5n.default/
[root@localhost twmiqm5n.default]# ll *db
-rw-------. 1 test test 65536 Jul 7 16:29 cert8.db
-rw-------. 1 test test 16384 Jul 7 16:29 key3.db
-rw-------. 1 test test 16384 May 28 20:38 secmod.db
把这个三个文件拷贝到指定文件下。比如：/root/.certs1
set from=224******53@qq.com
set smtp=smtp.qq.com
set smtp-auth-user=224******53@qq.com
set smtp-auth-password=euia********chb
set smtp-auth=login
set smtp-use-starttls
set ssl-verify=ignore
set nss-config-dir=/root/.certs1
mailx的操作还是蛮简单的，就是一直报一个错误
Error in certificate: Peer's certificate issuer is not recognized.
证书没有获得认可
解决方法：找个存放证书的目录
[root@localhost .certs]# pwd
/root/.certs
[root@localhost .certs]# ll
total 80
-rw-------. 1 root root 65536 Jul 8 15:13 cert8.db
-rw-r--r--. 1 root root 2293 Jul 7 16:25 qq.crt
-rw-------. 1 root root 16384 Jul 8 15:13 key3.db
-rw-------. 1 root root 16384 Jul 7 16:24 secmod.db
[root@localhost .certs]# certutil -A -n "GeoTrust SSL CA - G3" -t "Pu,Pu,Pu" -d ./ -i qq.crt
Notice: Trust flag u is set automatically if the private key is present.
这样就不会报错了。
Resolving host smtp.qq.com . . . done.
Connecting to *.*.*.* . . . connected.
220 smtp.qq.com Esmtp QQ Mail Server
>>> EHLO localhost
250-smtp.qq.com
250-PIPELINING
250-SIZE 73400320
250-STARTTLS
250-AUTH LOGIN PLAIN
250-AUTH=LOGIN
250-MAILCOMPRESS
250 8BITMIME
>>> STARTTLS
220 Ready to start TLS
Comparing DNS name: "mx2.qq.com"
................................
Comparing DNS name: "smtp.qq.com"
SSL parameters: cipher=AES-256, keysize=256, secretkeysize=256,
issuer=CN=GeoTrust SSL CA - G3,O=GeoTrust Inc.,C=US
subject=CN=pop.qq.com,OU=R&D,O=Shenzhen Tencent Computer Systems Company Limited,L=Shenzhen,ST=Guangdong,C=CN
>>> EHLO localhost
250-smtp.qq.com
250-PIPELINING
250-SIZE 73400320
250-AUTH LOGIN PLAIN
250-AUTH=LOGIN
250-MAILCOMPRESS
250 8BITMIME
>>> AUTH LOGIN
334 VXNlcm5hbWU6
>>> MjI0Njk0NTU1M0BxcS5jb20=
334 UGFzc3dvcmQ6
>>> ZXVpYXl1a3JrZ3JoZWNoYg==
235 Authentication successful
>>> MAIL FROM:<22******53@qq.com>
250 Ok
>>> RCPT TO:<username@163.com>
250 Ok
>>> DATA
354 End data with <CR><LF>.<CR><LF>
>>> .
250 Ok: queued as
>>> QUIT
221 Bye
sendEmail
下面来介绍sendEmail的使用
wget http://caspian.dotconf.net/menu/Software/SendEmail/sendEmail-v1.56.tar.gz
tar -zxvf sendEmail-v1.56.tar.gz
cd sendEmail-v1.56
mv sendEmail /usr/local/bin/
yum -y install perl-IO-Socket-SSL openssl-perl openssl-devel
sendEmail就可以使用了。应为sendEmail没有配置文件，所以在发送邮件的时候需要填上发件人的账户密码，没有mailx方便.
这是我们需要脚本辅助
#!/bash/sh
from_email='username@hotmail.com'
smtp='smtp-mail.outlook.com:587'
title='标题'
to_email=`username@qq.com`
passwd='passwd'
body=`cat test`
/usr/sbin/sendEmail -o tls=yes -f "$from_email" -s "$smtp" -u "$title" -o message-content-type=text -o message-charset=utf8 -t "$to_email" -xu "$from_email" -xp "$passwd" -m "$body"
以上是个简单的脚本，当然标题和内容以及发件人你都可以传参进来。这样的话就不会再命令行中暴露密码。
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