Sender Policy Framework (SPF)
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SPF is designed to fight the kind of spam problems that show up most heinously in Joe jobs; attacks forged at the envelope-sender level—the return path.

With SPF, a message transfer agent (MTA), such as UNIX sendmail or Microsoft Exchange Server, uses SPF to verify the envelope sender during SMTP time. If the envelope domain doesn't match an IP (or range) registered as authorized to send from that domain, the domains participating in Sender ID will fail that piece of mail at some level and deal with it according to the local configuration. currently supports SPF records.  They may added right from your control panel, or contact for more information.

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