Knowing an email was sent is useful. Knowing whether the person opened it, clicked it or replied is what tells you who to follow up with.
Fuse writes that straight onto the contact record, so you can filter and build views on it in your CRM.
This is available on Attio, HubSpot, Zoho and Pipedrive. It is not available on Salesforce.
The fields Fuse creates
Fuse creates these fields itself the first time engagement sync runs, so there is nothing to set up. On Zoho they are named Fuse Engagement, Fuse Last Engaged At and Fuse Last Campaign. They are named distinctly enough that they will not collide with your own attributes, and Fuse only ever writes to these three.
Availability
A few limits apply:
- Zoho writes engagement to the Contacts module only, so people pushed as Leads get no engagement fields. Zoho Standard edition allows only 10 custom fields per module.
- HubSpot portals connected before Fuse asked for permission to create contact properties need to reconnect once.
- Salesforce is not supported yet.
The whole picture, not per campaign
These fields describe the person, not a single campaign. Someone in three campaigns gets one combined view: if they opened one and clicked another, they show both Opened and Clicked.
Fuse last engaged at and Fuse last campaign always refer to their most recent engagement across everything.
This is deliberate. Your CRM holds one record per person, and the question a salesperson asks is “has this person engaged?”, not “what did they do in campaign four?”. For per-campaign detail, use the campaign report in Fuse.
Always current
Unlike sent emails, these fields are kept up to date. When someone who had opened later clicks, their record is updated to show both. The fields always reflect where that person stands today.
What it needs
Engagement sync is on by default. It does need Push contact records enabled, under Settings → Integrations → your CRM on the Sync tab, because engagement is written onto contact records. While contact pushing is off, engagement is held back, and it catches up once you turn it on.
A note on opens
Opened only appears for campaigns with open tracking turned on, which is off by default. Open tracking uses a tracking pixel, and some email clients and security scanners load that pixel automatically before a person has read anything, so Opened is a softer signal than the others.
Clicked and Replied are far stronger indicators of genuine interest. If you are building a follow-up list, prefer those.
Timing
Engagement sync runs every hour, alongside activity sync, so a click usually appears on the contact within the hour.
The first run backfills everyone who has engaged historically, which can take a few passes on a large account. 
