Like open relays, open proxies can also be used for illegal activities. The difference between them is how the connection happens. While open relays allow someone to establish a connection through Port 25 (SMTP), open proxies allow connections to email servers through a ports range.
SPF stands for Sender Policy Framework. It is a technology in which domain owners specify which computers on the Internet can send mail depending on the domain name, allowing the recipient to verify it. For further information, please click http://spf.pobox.com/.
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