linux mail 发送邮件

1.mail -s "Title“ 123456@163.com   只有主题，没有内容

2. 有邮件内容

echo "text" | mail -s "Title" 123456@163.com

cat file.txt | mail -s "Title" 123456@163.com

mail -s "Title" 123456@163.com < file.txt

3.向多个地址发送邮件

echo "send multiple mails" | mail -s "Multi" 123456@163.com,654321@163.com,321456@163.com