SPF ending “all” word explained

While creating a SPF record on Microsoft’s wizard, I noticed this question

Does {your email domain} send e-mail from any IP addresses that are not identified in the above sections?

There are several radio button options.

  • Yes; mail may legitimately originate from IP addresses not identified above.
  • No; this domain sends mail only from the IP addresses identified above.
  • Neutral; this domain makes no statement about whether mail may legitimately originate from IP addresses not identified above.
  • Discouraged; mail may legitimately originate from IP addresses not identified above, however, use of such IP addresses is discouraged and may not be permitted in the future.

At the end of the spf record there is the word “all”, for example my spf record is this:

v=spf1 include:spf.protection.outlook.com ~all

See the ~all at the end?

There are other options, each corresponding to the options above.

Yes is +all

No is  -all

Neutral is ?all

Discouraged is ~all

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About Mike

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