Hi,
At the moment I loaded emails via Nylas I got batch of requests by hidden pixels (which are in tag).
IP addresses were 73.186.11.215 and 71.212.139.100.
I couldn’t find any information about how Nylas handles images but AI Assistant at Nylas website said that Nylas doesn’t fetch images by url.
Could anyone help me?
Thanks for reaching out with your question.
Nylas uses a small, transparent tracking pixel (a one-pixel image) to detect when an email has been opened. This pixel is added to the HTML of outgoing emails for open-tracking purposes. When a recipient’s email client loads the message and requests the tracking pixel, Nylas records the event and sends a notification. The pixel’s URL typically looks like:
https://tracking.us.nylas.com/...
Nylas does not load or fetch any other images included in the email body—only the tracking pixel is managed by Nylas. If you notice image requests from unfamiliar IP addresses, these usually come from the recipient’s email client or a content delivery network (CDN) caching the image. For example, Gmail often caches images as soon as the email is received, which may trigger the tracking pixel before the recipient has actually opened the message.
If you’re displaying emails through your own application using the Nylas API, your application or infrastructure could trigger image downloads (including the tracking pixel). To avoid counting these as “opens,” you can programmatically block or hide the pixel URL when rendering sent messages.
I hope this helps, please let us know if you have any questions.