Tracking transactional email open and click engagement without triggering spam filter scanners

Webhooks & Events
1

How can engineering teams track link clicks and opens in transactional emails without trigger security bots (like Outlook Safelinks) that falsely inflate metrics?

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The Bot Scanner Problem

Corporate security filters (Microsoft Defender, Barracuda, Proofpoint) pre-fetch every link inside incoming emails before delivering them to users. This generates false click/open events within 2 seconds of dispatch.

Anti-Bot Tracking Strategies:

  1. Bot Filtering by User-Agent and Speed:

    • Filter out click events that occur within < 1 second of email dispatch.
    • Exclude known bot User-Agents (e.g. Mozilla/5.0 (Windows NT ... Microsoft Office)).

  2. AutoSend Built-in Smart Bot Detection:

    • AutoSend automatically filters pre-fetch requests from major enterprise scanners on the backend so your analytics accurately reflect real human clicks.

  3. Domain Alignment for Tracking Domains:

    • Use custom tracking domains (e.g. click.yourdomain.com) pointing CNAME records to AutoSend, avoiding shared tracking domain flags.