When an email bounces on a Microsoft connection, you may receive two webhook notifications for the same event:
message.bounce_detectedthread.replied
This happens because Microsoft Exchange delivers bounce notifications (NDRs) as a new message in the same conversation thread as the original email. Nylas correctly identifies it as both a bounce and a thread reply — so both webhooks fire.
On Google, bounces arrive as separate messages outside the thread, so you only get message.bounce_detected.
| Provider | message.bounce_detected | thread.replied |
|---|---|---|
| ✅ | ❌ | |
| Microsoft | ✅ | ✅ |
Want this changed?
If you'd like Nylas to suppress the thread.replied webhook for bounces, please submit a feature request.
Comments
0 comments
Please sign in to leave a comment.