mailx
wget http://ftp.debian.org/debian/pool/main/h/heirloom-mailx/heirloom-mailx_12.5.orig.tar.gz
tar zxvf heirloom-mailx_12.5.orig.tar.gz
cd heirloom-mailx-12.5/
make && make install UCBINSTALL=/usr/bin/install
vi /etc/nail.rc（在配置文件最后添加）
set from=m
