[Need help] How do you block the message with failed reverse lookup domain?

[Solt]

Hi,

I just started learning Zimbra, recently we have received a lot of fake emails from like xxxx@abc.com with IP (195.xxx.xx.xxx), the system fail to reverse lookup the ip address to it's domain, however it still pass the message to the receiver which I doesn't want to, so I would like to know if:

1. There is notification setup so that when we know when we receive this kind of message.
2. To block the message directly when the reverse lookup fail.

Thanks so much in advance.

Regards,
Litca

[Solt]

Can anyone help on this issue please ?

[soba@ukw.edu.pl]

Blockking this messages is very dangerous...

This action, in practice, gives the apparent safety.

See RFC 2822. 5322 and 5321.