Protect against spoofing & phishing, and help prevent messages from being marked as spam
If you don't have DKIM set up, Google doesn't recommend turning off SPF for your domain. Without SPF or DKIM, hackers and other malicious users can impersonate your domain, making messages appear to come from your organization or domain. Messages from your domain are also more likely to be sent to spam. If you've set up SPF and your messages are still being marked as spam, the cause could be something other than SPF. To identify the problem and try recommended solutions, see Troubleshoot SPF issues. If you're not able to identify or fix the issue, contact Google support.
Turn off SPF for your domain
To turn off SPF for your domain, delete the DNS TXT record for SPF at your domain provider. Use the steps in Add or update your SPF record as a guide.
For help with turning off SPF for your domain, contact your domain provider. Google doesn't support issues with your domain host.
