Question 1

What is an SPF record?

Accepted Answer

An SPF (Sender Policy Framework) record is a DNS TXT record that specifies which mail servers are authorized to send emails on behalf of your domain. It helps prevent email spoofing and improves deliverability.

Question 2

What is the 10 DNS lookup limit?

Accepted Answer

SPF has a maximum of 10 DNS lookups. If your SPF record requires more than 10 lookups (due to include mechanisms or redirects), it will fail. Use IP addresses instead of includes when possible.

Question 3

What is the difference between ~all and -all?

Accepted Answer

~all means softfail — unauthorized senders will be marked but not rejected. -all means hard fail — unauthorized emails will be rejected. +all allows all senders (not recommended). ?all is neutral.

Question 4

Where do I add the SPF record?

Accepted Answer

Add the generated SPF record as a TXT record in your domain's DNS settings. The host/name field should be @ or left blank for the root domain.