← Glossary
SPF
Sender Policy Framework — DNS record authorising which servers can send email for your domain.
SPF (Sender Policy Framework) is a DNS TXT record listing IP addresses authorised to send email on behalf of your domain. When you send from yourname@yourdomain.com via an ESP, the receiving server checks SPF to verify the sending server is authorised. Missing or incorrect SPF records cause authentication failures and spam filtering. All reputable ESPs provide SPF records to add to your DNS during custom domain setup.