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[root@localhost ~]# sh iptables_mail.sh 
iptables: No chain/target/match by that name
iptables: Bad policy name
iptables: Bad policy name
iptables: Bad policy name
: command not foundine 10: 
'ptables v1.3.5: Invalid target name `ACCEPT
Try `iptables -h' or 'iptables --help' for more information.
'ptables v1.3.5: Invalid target name `ACCEPT
Try `iptables -h' or 'iptables --help' for more information.
: command not foundine 15: 
'ptables v1.3.5: Invalid target name `ACCEPT
Try `iptables -h' or 'iptables --help' for more information.
'ptables v1.3.5: Invalid target name `ACCEPT
Try `iptables -h' or 'iptables --help' for more information.
: command not foundine 19: 
'ptables v1.3.5: Invalid target name `ACCEPT
Try `iptables -h' or 'iptables --help' for more information.
'ptables v1.3.5: Invalid target name `ACCEPT
Try `iptables -h' or 'iptables --help' for more information.
'ptables v1.3.5: Invalid target name `ACCEPT
Try `iptables -h' or 'iptables --help' for more information.
'ptables v1.3.5: Invalid target name `ACCEPT
Try `iptables -h' or 'iptables --help' for more information.
...

这种情况出现的原因是 iptables_mail.sh 文件格式是Windows格式，是因为文件末尾^M导致。
需要将文件格式转化为Unix格式即可。
可以使用Gvim等编辑器帮助转换。