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<indicator name="Faults">[[File:Menu-email.svg|link=:Category:Email|30px|Back up to the Email Category]]</indicator>
SPF = Sender Policy Framework
From Wikipedia:
SPF allows the receiving mail server to check during mail delivery that a mail claiming to come from a specific domain is submitted by an IP address authorized by that domain's administrators. The list of authorized sending hosts and IP addresses for a domain is published in the DNS records for that domain.
Many of the large email providers (Gmail, Yahoo, Office 365) are getting picky about accepting email that has no 'validation' mechanisms. Even if your email is not spam or junk they may treat it as so and either reject the message or put it in the recipients junk folder.
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