Fixing SPF Syntax Errors in Google Workspace

Understanding Google Workspace SPF Violations

Google Workspace enforces strict verification of Sender Policy Framework (SPF) records. An SPF record is a DNS TXT entry that designates which mail servers are permitted to send emails on behalf of your domain name.

Without an aligned SPF policy, your outbound corporate messages are highly vulnerable to receiving server rejection or getting flagged as suspicious. In Gmail, this often manifests as a 550 5.7.26 authentication error.

Common SPF Syntax Mistakes

• Multiple SPF Records: Having more than one TXT record starting with v=spf1 will instantly invalidate your policy. You must merge them into a single record.
• Too Many DNS Lookups: There is a strict limit of 10 nested DNS lookups. Google uses _spf.google.com which counts as several lookups itself.
• Incorrect syntax values: Writing ip4:1.2.3.4/24 without matching parameters or adding invalid modifiers will crash validation processes.

Step-by-Step Guide to Merging SPF Records

If you have a Google Workspace record: v=spf1 include:_spf.google.com ~all and a SendGrid record: v=spf1 include:sendgrid.net ~all, you must combine them into:

v=spf1 include:_spf.google.com include:sendgrid.net ~all

Update your registrar DNS zone (GoDaddy, Namecheap, or Cloudflare) with this combined record as a single TXT entry, delete the duplicate entries, and allow up to 24 hours for DNS propagation.