>> True, but one typically does not have nearly as many users over their >> quota than email addresses that don't exist (which are infinitely many). >> Besides, Spamcop typically would not be able to test that - they have to >> be very lucky to (1) find a mailbox that exist and (2) at the same time >> find one that's full.
AP> Spamcop is not testing your mail addresses. They have spam traps (mail AP> adresses which never have used for mail) which should not recieved AP> mails. This traps recievd bounces from you server. When now a spammer AP> send mails to a couple of your users with a forged address, bounces will AP> go out and when murphy want to a spamcop address. There is always an option to disable bounce messages :) It looks like in a couple of years nobody will be able to afford to send bounce messages anyway, as they will occupy 99% of mail server's traffic. I have a couple of domains that recieve 5-20k emails per day at random addresses. And there are several hundered domains on the mail server. Imagine if all domains were like the first 2... Karolis
