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SPF record

SPF is short from Sender Policy Framework. It's used to indicate to mail exchanges which hosts are authorized to send mail for a specific domain. It's defined in RFC 4408, and clarified by RFC 7208.

If you try to send emails from hosts, NOT authorized by the SPF, email exchanges can determine that it's most likely not authorized, and the email is marked as spam.

NOTE: If you do use it, you can only use those authorized hosts in the future, unless you make changes to it.

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