SPF failing to block spam

Sender Policy Framework (SPF) is supposed to fix a fundamental weakness in Internet e-mail by checking the origin of messages so you can reject ones with forged addresses. But spammers are already adopting SPF and using it with throwaway e-mail addresses, so the spam still gets through. However, CipherTrust Inc reckons it does help stop ''phishing", where users are sent e-mails that purport to come from their bank, credit card company or whatever. See The Boston Globe for more.