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blog.returnpath.com/how-to-explain-spf-in-plain-english

How it works: Brands sending email publish SPF records in the Domain Name System (DNS). These records list which IP addresses are authorized to send email on behalf of their domains. During an SPF check, email providers verify the SPF record by looking up the domain name listed in the “envelope from” address in the DNS.

www.dmarcanalyzer.com/SPF

An SPF record is a DNS record that has to be added to the DNS zone of your domain. In this SPF record you can specify which IP addresses and/or hostnames are authorized to send email from the specific domain. The mail receiver will use the “envelope from” address of the mail (mostly the Return-Path header) to confirm that the sending IP address was allowed to do so.

support.google.com/a/answer/33786

Sender Policy Framework (SPF) helps prevent spammers from sending unauthorized emails from your domain. This type of spamming is called spoofing. SPF is an email security method that helps prevent spoofing from your domain. Spoofing is a common unauthorized use of email so some email servers require SPF.

postmarkapp.com/guides/spf

The key technical detail with SPF is that it works by looking at the domain of the Return-Path value included in the email’s headers. The receiving server extracts the domain’s SPF record, and then checks if the source email server IP is approved to send emails for that domain.

support.dnsimple.com/articles/spf-record

Although the SPF record type is deprecated, it’s still supported by DNSimple name servers. In the future we may discontinue serving SPF records, so you should always have a TXT record whose content is the same as the record using the SPF type.

www.godaddy.com/help/what-is-an-spf-record-24605

A Sender Policy Framework (SPF) record is a type of Domain Name System (DNS) record that can help to prevent email address forgery.. Spammers can falsify email headers so it looks like they're sending from an email address at your domain. They can pretend to be you, allowing them to phish your users for private account information, or otherwise abuse your reputation.

www.verywellhealth.com/what-is-spf-1068889

SPF stands for sun protection factor. Simply put, an SPF rating tells you how long you can stay in the sun without getting burned while wearing that sunscreen, compared with how long you can stay in the sun before you burn without wearing that sunscreen. For example, if it typically takes you 15 minutes to burn without sunscreen and you apply an SPF 10, it will take 10 times longer (2.5 hours ...

blog.woodpecker.co/cold-email/spf-dkim

SPF, DKIM guide for dummies. Learn what they are and how to set them up in your DNS records, for better control over your email deliverability.

www.emailonacid.com/.../email-marketing/what-is-sender-policy-framework-spf

Read on to learn more about how SPF works and how it compares to other email authentication protocols. What Is a Sender Policy Framework (SPF)? SPF is a type of email authentication protocol or a way for a recipient to confirm that an email is truly coming from the sender and is not a piece of spam or a phishing attack.

www.saleshandy.com/blog/spf-dkim-record

SPF and DKIM are the two terms that sound technical even to an email marketing professional. But it is important to learn, understand and set up these records, especially if you are planning to send an email campaign, as it would have a huge positive impact on your campaign’s deliverability.