HubSpot uses include:_spf.hubspot.com for their sending infrastructure. A combined SPF for HubSpot + Google Workspace: v=spf1 include:_spf.google.com include:_spf.hubspot.com ~all. Add HubSpot only after enabling their Connected Domain feature in Settings → Marketing → Email → Verify Sending Domain — this also sets up DKIM CNAMEs. Watch the SPF 10-DNS-lookup limit: HubSpot + Google Workspace together consume ~3-4 lookups; adding SendGrid, Mailchimp, and Amazon SES on top can push you over. Verify with the SPF checker.
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What SPF include should I use for HubSpot?
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What Is an SPF Record?
SPF tells the world which servers are allowed to send email on behalf of your domain. A missing or misconfigured SPF record lets spammers forge your address — and sends your legitimate email straight to spam.