ingress SMTP

[mmc at internode.com.au (Matthew Moyle-Croft)]

*Hobbit* wrote:
>    > How do you alert mail server operators who are smarthosting their
>    > e-mail through you that their outbound messages contain spam?
>
> You don't let them falsify their envelope or headers to contain
> fields utterly unrelated to your own infrastructure, for starters.
> They try it, their mail bounces.  It's a very rare piece of
> spam that actually comes from who it says it comes from anymore.
>   
Are you suggesting that only ISP domains should be allowed through?  
(eg.  username at isp.net.au)
If you're forcing people to use your mail servers as a smart host then 
you wouldn't be very popular ...

MMC