Hi everybody!
I've been wondering what would happen if every mail server starts to
blindly accept every mail address as long as it belongs to a valid domain
served by this server. I think that is commonly known as catch-all or
blackholes.
As I see it, this would have two effects:
1) a dramatic rise of spam sent to non-existant mail addresses
2) huge numbers of non-existant mail addresses on spammers lists
Wouldnt that render the spam lists worthless in a rather short time? Nobody
would be able to distinguish real from wrong mail addresses anymore.
Directory Harvest attacks would have a 100% success rate but depending on
the program a almost 0% rate of useful results.
I am aware of the impact this might have on mail servers. But how long
would it take for spammers change their tactics?
cheers
Andreas
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