Virtualization makes spamming a very easy process:
1) Spammers signs up for VPS cloud hosting account with stolen credit card credentials.
2) Spamming software is installed and spammer begins email blasting. MailChannels research has seen a single VPS instance sending 8,000 SMTP connections per second - all spam.
Cloud hosts do not find out about fraud until the credit card chargeback - hours or days after spamming.
3) The IP address of the VPS cloud hosting account gets blocked.
It's difficult to identify spammers because of the use of proxies and stolen credit cards. Once the cloud hosting account's IP has been blacklisted, the spammer ditches the account, and repeats the same pattern again.
The main cost of spamming to a cloud host is fraud. Email deliverability is still reliable when fraud levels are low because only a small percentage of IPs are blacklisted. If cloud hosts don't get the outbound spam problem under control, the whole Internet becomes reluctant to receiving email from a cloud host's IP address space.
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