I receive a webhook message.opened immediately after sending an email with tracking

When sending an email you receive a message opened webhook immediately, additionally you do not receive any further message.opened notifications from that recipient.

We have observed the following behaviour:

• CDNs cache the image pixel across multiple proxies resulting in multiple reads.
• Gmail caches the images the moment they receive them, returning in message.opened webhook.
• Opening one email can trigger all the other emails stored by that provider to also trigger
• This can also result in multiple message.opened, message.link_clicked webhooks being recorded

To get around this this it is advised that you disregard immediate responses and store the objects in a SET to eliminate duplicates. Please note that tracking is becoming harder as browsers and providers harden privacy.

Resources:

https://developer.nylas.com/docs/support/troubleshooting/immediate-webhook-notification/ 

Updated March 31, 2023 07:50