Re: blocking mail sent from <> (NULL Addresses)

[Eric Paynter]

On September 14, 2001 10:56 am, Ian LeBlanc wrote:
> I am talking MILLIONS of emails... I can not track where they are
> generating the mail
> from but it is now causing us a lot of trouble as ISPs are starting to
> block our server
> and I in the meantime get hundred thousand bounce messages.
>
> We are actually now considering changing MTAs because there seems to be no
> fix for what is going on and we see that as a problem.

Your smtp server will have the source IP in the logs. You can block that IP 
or IP range using tcpserver or your firewall or whatever you have.

You can also use tarpitting to slow down the bulk mail...

You should also consider disabling relaying for exterior IPs...

-Eric

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