An extension of SMTP which stops email spammers from forging the "From" fields in an e-mail. Due to SMTP itself does not have the mechanism to authenticate, SPF provides the authentication scheme by specifying which computers are authorized to send email from a specific domain. To use SPF, the domain sending e-mails must establish an SPF record that is published in DNS records. When e-mail passes through the DNS server, it is compared to the SPF record for that domain to determine if the sender is authorized to send e-mails from that sender's address. If the e-mail comes from a domain that is not authorized, the DNS server will not forward the e-mail to the expected destination. SPF only stops the spammer from forging the "From" field in the e-mail and does not stop the spammer from sending e-mails from a domain in which it is a member. To use SPF, the following standard have been declared. domain.com. IN TXT "v=spf1 a mx -all" From the rules, v stand for the version of SPF and currently available for spf1(version 1) only. Eight mechanisms are defined: - ALL - Matches, used default result like -all - A - A record that can be reach. - IPv4 - IPv4 address range. - IPv6 - IPv6 address range. - MX - Mail Exchange record match. - PTR - Reverse DNS (Record). - EXISTS - If the given domain name resolves to other name. - INCLUDE - Include policy.
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