Re: [Exim] rejected messages

> | > This would allow triggering on messages sent via known relays ie
> | > rss.mail-abuse.org or Spews.relays.OsiruSoft.com.
>
> | This is a bad idea. What about, for example, dialup lists?
>
> Use or don't use the DUL as you feel appropriate. Many people feel
> that dialup users ought to be using their ISP as a relay instead of
> delivering directly anyway.

Er, you missed the point, which was if you do Received: header checking,
and you check against the DUL, then you will get a positive hit even if
they *DO* use their ISP as a relay and are sending alegitimate message,
becuase presumably, their ISP will insert a Received: header as it
receives the message from them.


> | It also assumes that you trust the veracity of the Received: headers
> | that your mailserver doesn't generate,
>
> Yeah. Likewise for all other information in an email or its envelope
> (aside from the RCPT).

Using the RBL normally means you use the remote IP address of the socket
as its connecting to you. This is a reasonable item to truse, as this is
almost impossible to do, unless you are somehow abe to spoof BGP, which
is pretty rare.