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"v=spf1 +all" : The domain owner thinks that SPF is useless and/or doesn’t care.

"v=spf1 -all" : The domain sends no mail at all.

"v=spf1 mx -all" : Allow domain’s MXes to send mail for the domain, prohibit all others.

– (minus) for HARDFAIL : all emails that are suspected to be forged or spam are rejected and not delivered (e.g. -all – allow only mail that matches one of the parameters).

~all – Allow mail whether or not it matches the parameters)

~ (tilde) for SOFTFAIL : emails are accepted / shown for the user, but marked with a warning as suspicious/spam (e.g.

? for a NEUTRAL : all emails are accepted (e.g. ?all – no policy statement).

This can be omitted e.g., +mx is the same as mx We can use any mechanism with any of the four qualifiers: SPF only checks the “From” part of the email.Ĭheck domain SPF: nslookup -type=txt. If they don’t, email might be marked as spam, or rejected. It will compare that info with the originating IP address/email.

Email providers that have SPF will lookup DNS records of the domain from where the email is claiming to be.

This IP/Domain list is stored in the DNS records of the domain TXT record. It’s specifying a technical method to prevent sender address forgery. The Sender Framework Policy preovides a list of IP addresses that are authorized to send email on behalf of the domain. SPF (Sender Policy Framework) is here to hardens your DNS servers and restricts who can send emails with your domain name. Quick overview of SPF email validation protocol (Examples, Vulnerabilities).