Originally Posted By: LittleBlueThing

But, as usual with any spam solution you need to ask the experts : why won't this work?

Exactly. SPF and domain certs for example aren't really usable if you use websites (such as separately hosted blogs or social networks) where third party machines end up sending out emails on your behalf.

Just like whitelists don't work very well if you buy lots of stuff online as you can never be sure whether they will send out the order confirmation email from a domain even vaguely close to the one the website is using cry
_________________________
Remind me to change my signature to something more interesting someday