Unexpected Immediate message.opened Events for Gmail Recipients

Question and Answers
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1

Hello Nylas Team,

We are experiencing unexpected behavior with the message.opened webhook event when sending emails to Gmail recipients and would appreciate clarification.

Observed Behavior:

  • When sending emails with open tracking enabled, we consistently receive a message.opened event for Gmail recipients almost immediately after the email is sent.

  • This occurs even when the recipient has not opened the email.

  • The event is typically triggered within seconds of delivery.

Comparison Testing:

  • When sending the same email to non-Gmail providers (e.g., Hotmail), the message.opened event behaves as expected and is triggered only after the recipient actually opens the email.

  • The issue appears isolated to Gmail recipients.

Configuration Details:

  • Open tracking is enabled via tracking_options.opens = true.

  • The webhook endpoint is properly configured and verified.

  • We are not performing any automated email previews or programmatic email fetches on our side.

  • The behavior is reproducible across multiple Gmail accounts.

Questions:

  1. Is this expected behavior due to Gmail’s image proxy or caching mechanism?

  2. Does Nylas differentiate between a real user open and a proxy-triggered image fetch?

  3. Are there any recommended mitigation strategies to avoid false-positive open events for Gmail recipients?

  4. Is there any metadata in the webhook payload (e.g., user agent, IP classification, proxy indicator) that can help us distinguish automated fetches from genuine opens?

This behavior makes message.opened unreliable for Gmail users, and we would like to understand whether this is a known limitation or a configuration issue on our side.

Thank you for your guidance.

Best,
Rehan

2

Hello Rehan,

That’s a provider limitation.

Please see this article:
Why am I receiving multiple ‘message.opened’ webhook notifications?

Many thanks,
Samuel R.
Support Engineer, Nylas

3

@Samuel.R the solution shared in the article is not working.

Ideally, the open event should be triggered every time the recipient opens the email. This is functioning correctly with Outlook, but not with Gmail.

I also noticed that the 1x1 tracking pixel in the email is returning a 404 response. I’m unsure whether this is due to an expiry issue, a misconfiguration, or something else.

Is there any configuration parameter we might be missing when sending the email? If not, this seems like it could be a bug.

4

Hello abdulaala. Our Support team has reached out to you via email to continue this investigation. Please check your mailbox for our message.