Quick Answer: When a prospect opens a tracked sales email in HubSpot, you get more than a simple "Opened" flag. HubSpot measures how long the recipient's email client actually rendered the message and sorts that dwell time into three categories: Read (8 seconds or more), Skimmed (2 to 8 seconds), and Glanced (under 2 seconds). You'll find the breakdown on a sent email's Recipients tab, under the "Filter by" dropdown next to the Opened event — the same "All opens / Read / Skimmed / Glanced" menu shown in HubSpot's UI. For sales reps, that distinction turns a vague open notification into a real prioritization signal: a "Read" on a proposal is worth a same-day call; a run of "Glanced" opens usually is not. Like all pixel-based tracking, it has real accuracy limits — treat the category as directional, not proof.
HubSpot counts an email as opened the moment its tracking pixel — a tiny, invisible image embedded in the message — loads in the recipient's email client. On its own, that tells you almost nothing about attention: a contact can open an email and close it in a second, or read every line twice. To close that gap, HubSpot also measures how long the message stayed rendered on screen and sorts that dwell time into three labels.
| Category | Time Viewing the Email | What It Likely Means |
|---|---|---|
| Read | 8 seconds or more | The recipient likely read some or all of the content — the strongest attention signal HubSpot reports. |
| Skimmed | 2 to 8 seconds | The recipient saw the subject line and opening lines, or scanned for a specific detail — recognition, not necessarily engagement. |
| Glanced | Under 2 seconds | Often a preview pane or notification badge triggering the pixel — the weakest signal, and the easiest to mistake for real interest. |
A category is only assigned when the recipient's email client reports how long it displayed the message. Some widely used clients, including Gmail, don't share that data, so a portion of your "Opened" recipients will never get sorted into Read, Skimmed, or Glanced — they'll simply show as opened with no attention label, per HubSpot's own marketing email performance documentation. Worth checking against your own portal: this level of detail requires a Marketing Hub Starter, Professional, or Enterprise subscription.
For a one-to-one sales email sent from a connected inbox, HubSpot's CRM timeline gives the familiar binary signal first: an "Email opened" notification the moment the client renders it. The deeper attention breakdown lives one level down: open the sent email, click into the Recipients tab, select the Opened event, and use the Filter by dropdown to narrow the list to All opens, Read, Skimmed, or Glanced. If your team uses HubSpot Sales Hub for one-to-one outreach, these labels sit on top of the same open-and-click tracking that already drives your real-time notifications.
An "Opened" flag treats a two-second glance and a two-minute read as identical events. Reps who chase every open as a buying signal end up making calls off false positives, and reps who ignore opens altogether miss contacts who are genuinely engaged. Attention level is a rough but useful proxy for where a contact sits in their decision process — closer to "did they notice this" than "are they sold" — and costs nothing extra to check, since HubSpot already tracks it for every open it logs. It isn't a verdict on its own, though; treat it as one more input, alongside replies, clicks, and deal stage, for deciding where to spend a limited number of calls each day.
Used well, this data changes the order of your workday rather than the content of your pitch:
This works best alongside deal-level engagement tracking rather than in isolation, not as a standalone verdict — we cover a fuller version of that approach in our guide to nurturing long B2B sales cycles in HubSpot.
Every open HubSpot reports — and every category built on it — starts from the same mechanism: a tracking pixel that loads when the email renders. That's reliable for "did a client load this image," but not "did a human read this." HubSpot's documentation on open and click tracking and bot filtering lists several sources of non-human activity that can inflate your open rate and your Read/Skimmed/Glanced counts.
For users who enable it, Apple Mail Privacy Protection pre-loads message images through a proxy server as soon as an email arrives, regardless of whether the person ever opens it — registering an open, and sometimes a viewing duration, that no human generated.
Enterprise email gateways and security tools that scan inbound messages for malware before they reach an inbox can trigger the same tracking pixel while scanning. HubSpot's bot filtering is built specifically to catch and exclude activity like this, along with known automated scanners.
Because Read, Skimmed, and Glanced inherit the same underlying open event as your raw open count, none of them are immune to these false positives — a Read generated by a scanner looks identical to a Read generated by a person, which is exactly why the category should inform your prioritization, not replace your judgment.
A few habits keep this data useful instead of misleading:
As a HubSpot Solutions Partner, Vantage Point configures email tracking, sequences, and deal-level engagement scoring so reps get a reporting setup built on genuine attention signals instead of raw, unfiltered open counts. That includes confirming bot-filtering settings, combining opens with clicks and replies in reporting, and training teams to prioritize follow-up using attention data rather than vanity metrics. Senior consultants only — no junior handoffs; the experts you meet are the experts who deliver.
Vantage Point configures HubSpot email tracking, sequences, and reporting so your team spends its calls on the contacts who are genuinely paying attention. Contact Vantage Point to talk through your setup, or explore our Sales Hub services to see how we support HubSpot sales teams end to end.
They describe how long a recipient's client rendered your email: Read means 8 seconds or more, Skimmed means 2 to 8 seconds, and Glanced means under 2 seconds. HubSpot only assigns a category when the client reports that rendering duration.
HubSpot's tracking pixel and client-side rendering data estimate how long an email stayed open, then sort that duration into Read, Skimmed, or Glanced. Some clients, including Gmail, don't report rendering data, so not every open gets a category.
Open the sent email, go to the Recipients tab, click the Opened event, and use the Filter by dropdown to switch between All opens, Read, Skimmed, and Glanced. It requires a Marketing Hub Starter, Professional, or Enterprise subscription.
Not on its own. A Glanced open often just means a preview pane or notification badge triggered the pixel, not real engagement. Wait for a corroborating signal — a reply, a click, or a later Read — before concluding interest has cooled.
The category depends on the recipient's client reporting how long it displayed the message, and some popular clients don't share that data. Those recipients still count as an open, but won't appear under any of the three categories.
Yes. For users who enable it, Apple Mail Privacy Protection pre-loads message images through a proxy server regardless of whether the person opens the email, registering an open — and potentially a viewing duration — no human generated. HubSpot's bot filtering is designed to catch much of this activity.
Bot filtering is a HubSpot setting, on by default, that excludes suspected non-human activity — including Apple Mail Privacy Protection pre-fetches and corporate scanners — from your email data. Most teams should leave it on for a more reliable view of genuine engagement, even if reported opens look slightly lower.
Yes. Vantage Point is a HubSpot Solutions Partner that helps sales and RevOps teams configure email tracking, sequences, deal-level engagement scoring, and reporting so reps can act on genuine attention signals instead of raw open counts. Senior consultants only — no junior handoffs; the experts you meet are the experts who deliver.
Vantage Point is a boutique CRM consulting firm helping businesses transform with Salesforce, HubSpot, and AI — 150+ clients, 400+ engagements, and a 4.71/5 average engagement rating. Learn more at vantagepoint.io.