Re: [Exim] Problems caused by localhost entry in Received

Giuliano Gavazzi wrote:

> At 1:04 pm +0100 2004/01/07, Toralf Lund wrote:
>
>> Or perhaps that has nothing to do with it? I've always been under the
>> impression that the RBL checks would also consult the Received headers,
>> but I'm beginning to think I've been wrong all along. Are the headers
>> in any way checked automatically, or just the connecting IP of the SMTP
>> connection?
>
>
> how would they? Most of the time, if not always, RBL checks are used
> in the RCPT phase, when the headers are not even known. And it would
> open the gates for all sort of attacks, imagine a message coming with
> hundreds of Received: header lines...

Yes. The search might easily be limited to a fixed number of entries or
similar, though.

Obviously, it might be useful if messages are relayed in several steps
via multiple servers (all of which are "bad", presumably), and only some
of them are RBL-listed. I don't know how likely that is...

- Toralf