Best email tracking software and tools (2026): what to track, and what to ignore

We track campaigns inside the sending platform and one-to-one rep email inside the CRM, and we report on replies and meetings rather than opens.

Inbox add-ons for individual reps come first, then sales engagement platforms, then cold email tools with tracking built in.

Open tracking works by loading a tiny invisible image when the email is displayed. Since iOS 15, Apple's Mail Privacy Protection downloads that remote content in the background when a message is received, not when it is read, so Apple Mail users show as opens whether or not they looked. Apple says so on its Mail privacy support page. The same page notes that the protection does not cover links, so clicks still mean someone acted.

Image blocking in other clients undercounts opens in the opposite direction. The result is that open rate is no longer a reliable read on interest or on subject line performance.

Usually not. Tracking pixels and rewritten tracking links add markup that spam filters notice, and both Instantly and lemlist now document options or advice to disable open tracking to improve deliverability. For cold email we turn opens off, leave click tracking off unless a link is central to the campaign, and judge results on replies, positive replies, and meetings booked.

Keep the rest of your setup in line with Google's sender guidelines: authenticated domains, easy unsubscribes, and low spam complaint rates. Our free deliverability checker tests the DNS side.

Picking a tracking tool is easy. Knowing what the numbers mean is harder, and many teams optimize subject lines for open rates that Apple inflated, while deliverability quietly slips. OneGTM sets up sending infrastructure, reporting on replies and meetings, and alerts when placement drops, so you see what is really working.

Email tracking and email analytics answer different questions. Tracking tools report on what a recipient did with one email or one campaign: opened, clicked, replied. Email analytics tools report on how your own team handles email: how fast each person replies, how many threads they carry, and which customers are waiting. Sales leaders usually want the second kind once a team shares inboxes or promises a response time.

These tools read message headers through the Gmail or Outlook API, not the content, and build reports from timestamps. Prices below are from each vendor's pricing page, checked November 1, 2026.