---
title: SPF (Sender Policy Framework)
description: Learn how SPF and DNS records improve email security and deliverability by verifying authorized mail servers for your domain.
---
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August 11, 2025
# SPF (Sender Policy Framework)
### **SPF (Sender Policy Framework)**
Sender Policy Framework (SPF) is an email authentication protocol that helps prevent spoofing by verifying which mail servers are authorised to send emails for your domain.
An SPF record, set as a TXT record in your domain's DNS, lists these permitted servers. When a recipient's mail server receives a message, it checks this SPF record to confirm legitimacy; emails from authorized servers are accepted, others are rejected as spam.
For optimal deliverability, we recommend adding the DNS SPF record: `include:spf.app.customerthermometer.com`
### **How do I update the SPF records?**
The exact process varies from one service provider to another; generally, it involves editing an existing DNS TXT record and adding our SPF record. Your IT Team should be able to help you with this request.
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