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Slashy embeds an invisible tracking pixel in outgoing emails so you know when a recipient opens your message.
Email tracking is not 100% reliable. Privacy features in Apple Mail, corporate firewalls, and image-blocking settings can prevent tracking pixels from firing. Treat open data as a signal, not a certainty.

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How It Works

When tracking is enabled, each outgoing email gets a tiny invisible image per recipient. When the recipient’s email client loads images, Slashy records:
  • Exact timestamp
  • Device type and OS
  • Email client
Tracking is per-recipient — if you send to three people, you see exactly who opened.
Email tracking panel showing open timestamps, device info, and recipient details

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Enabling and Disabling

Globally: Settings (Cmd+,) > Account > toggle Email Tracking Per email: Toggle tracking on/off in the compose window before sending.

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Viewing Open Data

Press d o to open the Recent Opens panel — a live feed of who’s reading your tracked emails. Each entry shows: recipient name, email subject, time opened, device type, OS, and email client. You can also view tracking data on individual threads — sent messages show an “Opened by” indicator. On mobile, the read receipt sheet shows each recipient with their contact avatar next to their open status, so it’s easy to scan who has and hasn’t opened at a glance.
Compose window with email tracking toggle

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When Tracking Doesn’t Work

If a recipient replies to a tracked email but the pixel never fired, Slashy still shows the message as opened, labeled “Opened. Privacy protection likely blocked tracking.” so you’re not left guessing why the open count reads zero on a message you clearly got a reply to.

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Team Read Receipts

If a teammate CCs you on an email they sent with tracking on, you see the same open data they do, right on the thread. There’s nothing to set up: as soon as you’re on a tracked message together, opens show for both of you. See Team management to invite teammates.

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Auto-Open Filtering

Slashy filters automated opens from Gmail Image Proxy, Apple MPP, Microsoft SafeLinks, and corporate security scanners. You may miss occasional real opens, but the ones you see are genuine.

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Open Trigger Automations

Create automations that fire when a tracked email is opened — for example, get notified when a prospect opens your proposal.
1

Open the agent sidebar

Press Cmd+/ or d a.
2

Ask the agent to create an open trigger

Example: “Create an email open trigger: when anyone at @bigclient.com opens my email for the first time, message me on iMessage.”
3

Define your condition and action

The agent shows a preview of the trigger for your confirmation. Adjust the scope or action as needed.
Open triggers include the same auto-open filtering and can fire on first open only or every open.
Combine email tracking with the Follow-Up Nudge automation for a powerful outreach workflow: track opens, then auto-draft a follow-up if the recipient opens but doesn’t reply within 3 days.

10 Automations

Set up email open alerts and more

Never Miss a Follow-up

Four layers of follow-up protection

Slashy for Sales

Sales workflows using tracking and follow-ups

Customer Follow-ups

Automated follow-up tracking for key accounts