SPF
Sender Policy Framework: a DNS record that lists which servers are allowed to send email for your domain.
SPF (Sender Policy Framework) is an email authentication standard published as a TXT record in your DNS. It lists the IP addresses and servers that are authorized to send email on behalf of your domain. When a receiving mail server gets an email from your domain, it checks the SPF record to see if the sending server is on the authorized list. If not, the email may be marked as spam or rejected. A common SPF record looks like: v=spf1 include:_spf.google.com ~all (authorizing Google to send email for the domain).
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