Webone blocking port 25??

[Jeremy]

> And that prevents you from being blacklisted how, exactly?
> 
> Rather - it lets any customer use the ISP's mail server to relay spam,
> and hence get that ISP and ALL their customers blacklisted, regardless
> of the fact that the individuals at the ISP and their other customers
> did not spam.

It gives you logfiles that you can analyse to decide whether or not 
they are scumbag spammers.

That way, if someone does pee in the pool, you know who to blame it 
on.  Otherwise you end up on the DUL, which is apparently much harder 
to get off.