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Immediate Webhook Notification

Nylas detects an email has been read by embedding an image pixel into the message HTML. The image pixel needs to be downloaded for Nylas to detect that the message was opened. Only the initial download is tracked.

After a message has been sent, an immediate message.opened webhook is sent.

Causes Immediate Webhook Notification

  • CDNs cache the image pixel across multiple proxies resulting in multiple reads.
  • Gmail caches the images the moment they receive them, returning in a message.opened webhook.

Solutions Immediate Webhook Notification

  • Exclude your IP address ranges
  • Use open tracking with link clicks to determine that messages have been opened and clicks have been clicked.
  • Remove recent objects with a timestamp of less than 1 minute of the message sent_at time.
        "recents": [
"ip": "12.234.567.89",
"link_index": 0,
"id": 0,
"user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36",
"timestamp": 1602623980.