# cat mail.sh
#!/bin/bash
subject=$(echo "測試郵件"|base64)
mail=`cat /tmp/mail.txt | base64`
/usr/sbin/sendmail -t <<EOF
From: system@example.com
To: chao.zhang@example.com
Cc: sky.lv@example.com
Bcc: xinying.wen@example.com
Subject: =?utf-8?B?$subject?=
Content-Language: zh-cn
Content-type:txt/plain;charset=UTF-8
Content-Transfer-Encoding: base64

$mail

EOF