Can Clay log sequencer email activity (like sent emails and dates) back to HubSpot CRM?

This isn't natively supported yet, but you can use a workaround with Clay's HTTP API enrichment to call HubSpot's API directly. First, create a HubSpot Private App Token with permissions for Notes/Emails/Engagements. Then add an HTTP API enrichment in your Campaign Events table to POST to HubSpot's Notes or Engagements API (api.hubapi.com) with your activity details. The JSON payload should include the email subject, date, and contact associations, which will appear on the contact's timeline in HubSpot. Make sure to put the JSON in the Body field (not headers) and use proper header formatting with your Bearer token.