The service is not really setup for spammers. As the name says its a scammer spammer setup for the Nigerian scammers with scams like send your drivers license and $235 to
[email protected] to have your $25 million dollars sent by ATM card. While some of the scammerspammer emails end up in the trash can a scammer afford to not check everyone, even the ones in the spam box? That's 3000 - 5000 emails to sort through in the hopes that one person sent his personal information. As I said before its not ment for emails like "check out our new Viagra" or "Canadian pharmacy"....
Also: I have to verify and approve every email address submitted because people were abusing the system, but I also increased the number of emails sent and change ipaddresses every 3 days