OnDMARC

SPF must be implemented on the sender's side and the recipient must be doing SPF validation on emails coming into their network.

Should SPF be implemented in both sender and receiver in order to avoid spoofing?

Demonstration of how to create an SPF record in DNS using Cloudflare which authorizes G Suite to send emails

How to create an SPF record in DNS using Cloudflare?

How does SPF compare to DMARC and why is DMARC needed to stop domain phishing and spoofing?

I have SPF, do I really need DMARC to protect my domain? What does DMARC do that SPF does not?

SPF record troubleshooting and top tips

What is SPF?

How to look up SPF, DKIM and DMARC records using the command line and terminal.

Looking up SPF, DKIM and DMARC records in DNS

What is the include statement found in an SPF record?

What is an include in SPF?

My email provider supports only SPF  and does not support DKIM, what should I do?

What if my email provider doesn't support DKIM?

Suggestion on why SPF should be used along with DKIM to improve email deliverability.

Can I use only SPF and DMARC, without DKIM?

Information on the +all mechanism in SPF, what it means and why it should not be used in your SPF records.

What is the +all mechanism in SPF and should I use it?

Information on the record type used by SPF and the old deprecated record type which should not be used.

Which DNS record type is used by SPF?

Information on how SPF works, what identifier it uses for authentication and how to protect your domain from being spoofed.

Does SPF protect my domain from spoofing?

I received an SPF PermError, what caused this? What are some of the causes for an invalid SPF record?

Invalid SPF record mechanism

What is a ptr record, how does it work and why it should not be used as a mechanism in an SPF record?

PTR mechanism in an SPF record

Should I include more than one SPF record in my DNS for each service I use?

Multiple SPF records

SPF DNS Lookup Limit

A hardfail indicates that an email isn't authorized and should be rejected, whereas a softfail suggests an email should be diverted to spam.

SPF Hard fail vs SPF Soft fail

Ivan

Information about SPF, what SPF does and how SPF works

Learn about SPF

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