下载msmtp软件，当前最新版1.4.27

http://downloads.sourceforge.net/project/msmtp/msmtp/1.4.27/msmtp-1.4.27.tar.bz2

1、编译软件

tar jxvf msmtp-1.4.27.tar.bz2
cd  msmtp-1.4.27
./configure --prefix=/usr/local/msmtp
make
make install

2、看一下配置文件在哪里

# /usr/local/msmtp/bin/msmtp --version
msmtp version 1.4.27
Platform: x86_64-unknown-linux-gnu
TLS/SSL library: OpenSSL
Authentication library: built-in
Supported authentication methods:
plain cram-md5 external login 
IDN support: enabled
NLS: enabled, LOCALEDIR is /usr/local/msmtp/share/locale
Keyring support: none
System configuration file name: /usr/local/msmtp/etc/msmtprc#默认配置文件的路径
User configuration file name: /root/.msmtprc

Copyright (C) 2012 Martin Lambers and others.
This is free software.  You may redistribute copies of it under the terms of
the GNU General Public License .
There is NO WARRANTY, to the extent permitted by law.

3、msmtp的配置文件

mkdir -p  /usr/local/msmtp/etc

touch /usr/local/msmtp/msmtp.log

vi /usr/local/msmtp/etc/msmtprc

输入以下内容

defaults
logfile /usr/local/msmtp/msmtp.log
account gmail
tls on
host smtp.gmail.com
port 587
from username@gmail.com
tls_certcheck off
auth login
user username@gmail.com
password password
account default : gmail

4、配置mutt

一般系统已经安装了，如果没有安装的话请使用 yum install mutt 安装

# tail -5 /etc/Muttrc

#vi /etc/Muttrc.local
set sendmail="/usr/local/msmtp/bin/msmtp"
set realname="测试服务器"
set use_from="yes"
set charset="UTF-8"
set editor="vi"

5、测试一下发送邮件

#echo "测试邮件内容" | mutt -s "测试邮件主题" username@domain.com

tail -f /usr/local/msmtp/msmtp.log 看看有没有成功，或者进入上面的邮箱看看是否收到邮件。