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support.dnsimple.com/articles/spf-record

An SPF record is a Sender Policy Framework record. It’s used to indicate to mail exchanges which hosts are authorized to send mail for a domain. It’s defined in RFC 4408, and clarified by RFC 7208. SPF record format. SPF records are typically defined using the TXT record type. There’s also an SPF record type, but it’s deprecated, and ...

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

An SPF (Sender Policy Framework) record is a type of TXT record in your DNS zone file. SPF records help identify which mail servers are permitted to send email on behalf of your domain. Adding an SPF record can help detect and prevent spammers from sending email messages with forged From addresses on your domain.

en.wikipedia.org/wiki/Sender_Policy_Framework

Sender Policy Framework (SPF) is an email authentication method designed to detect forging sender addresses during the delivery of the email. SPF alone, though, is limited only to detect a forged sender claimed in the envelope of the email which is used when the mail gets bounced. Only in combination with DMARC can it be used to detect the forging of the visible sender in emails (email ...

kb.intermedia.net/Article/1010

Sender Policy Framework (SPF) is an open standard specifying a technical method to prevent sender address forgery. We strongly recommend creating an SPF record to ensure that recipients recognize forged messages sent using your domain. Note: in most cases there must be only one record per domain, and it must be published as a TXT resource ...

blog.mailtrap.io/spf-records-explained

ISP can use a dedicated TXT type record, SPF record, to authenticate the email. This record contains data about the trusted servers authorized by your domain. So, your ISP can identify a source an email is coming from and detect a forged email. SPF or Sender Policy Framework is a primary but not the only standard to authenticate your email.

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.

www.dmarcanalyzer.com/spf/how-to-create-an-spf-txt-record

Your new SPF record can take up to 48 hours to go into effect. For help adding TXT records, contact your domain host. Step 4: Test your SPF record with the SPF record Checker. Setting up the an SPF record is an essential part of your technical settings.

support.google.com/a/answer/33786

SPF record mechanisms. The tags used to create an SPF record are called mechanisms. Important: An SPF record can have up to 10 lookups. These mechanisms in an SPF record generate a lookup: a, mx, and include. If your SPF record has more than 10 lookups, messages from your domain won’t pass the SPF authentication check by the receiving server.

docs.microsoft.com/en-us/microsoft-365/security/office-365-security/set-up-spf...

Once you have formed your SPF TXT record, you need to update the record in DNS. You can only have one SPF TXT record for a domain. If an SPF TXT record exists, instead of adding a new record, you need to update the existing record. Go to Create DNS records for Office 365, and then click the link for your DNS host. Test your SPF TXT record.

mxtoolbox.com/spf.aspx

ABOUT SPF RECORD CHECK. The SPF Record Check is a diagnostic tool that acts as a Sender Policy Framework (SPF) record lookup and SPF validator. This test will lookup an SPF record for the queried domain name, display the SPF Record (if found), and run a series of diagnostic tests (SPF Validation) against the record, highlighting any errors found with the record that could impact email delivery.