# Issue with SendGrid Webhook Integration in Mautic (/mailer/callback) for Bounce Events

**URL:** <https://forum.mautic.org/t/issue-with-sendgrid-webhook-integration-in-mautic-mailer-callback-for-bounce-events/34898>\
**Category:** Product Support\
**Created:** [January 30, 2025, 1:29pm UTC](https://forum.mautic.org/t/issue-with-sendgrid-webhook-integration-in-mautic-mailer-callback-for-bounce-events/34898 "2025-01-30T13:29:09Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![gandhi](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/gandhi/32/13476_2.png) [@gandhi](https://forum.mautic.org/u/gandhi)\
**Post date:** [January 30, 2025, 1:29pm UTC](https://forum.mautic.org/t/issue-with-sendgrid-webhook-integration-in-mautic-mailer-callback-for-bounce-events/34898/1 "2025-01-30T13:29:09Z")

</div>

**Your software**  
My Mautic version is: 5.4.35

**Your problem**  
My problem is:  
Issue with SendGrid Webhook Integration in Mautic (`/mailer/callback`) for Bounce Events

I’m currently using the DSN for sending emails, which works perfectly:  
(shared in ss)

Emails are sent successfully without any issues.  
To handle bounce events, I set up a webhook in SendGrid pointing to:  
https://my\_mautic/mailer/callback

These errors are showing in the log:  
[2025-01-30 12:28:28] Webhook Request:

Headers: {“host”:[“…”],“user-agent”:[“SendGrid Event API”],“content-length”:[“319”],“accept-encoding”:[“gzip”],“content-type”:[“application/json;charset=utf-8”],“x-forwarded-for”:[“…”],“x-forwarded-host”:[“3d9f-103-206-136-133.ngrok-free.app”],“x-forwarded-proto”:[“https”],“x-twilio-email-event-webhook-signature”:[“MEQCIDQhKl+9/docY4dl6hNgK8fJNviJurCK1ajuvo9UUSeOAiB/hshyHoWKVzKNuJhyzTRQppUI8MN4CMFNel09MKs1SQ==”],“x-twilio-email-event-webhook-timestamp”:[“1738240105”],“x-php-ob-level”:[“1”]}

Query Params:

Payload: [{“[email":"demo1sxasxs@gmail.com](mailto:email%22:%22demo1sxasxs@gmail.com)”,“event”:“dropped”,“reason”:“Bounced Address”,“sg\_event\_id”:“ZHJvcC00ND…mZWeFAzXzlBLTA”,“sg\_message\_id”:“0Tn2brHyRCe62RfVxP3…7068-16.0”,“smtp-id”:“\<050dcd440eb87e91.857b0d@st…ions.in\>”,“timestamp”:1738240104}]

[2025-01-30 12:28:28] Response Status: 404

Response Content: No email transport that could process this callback was found

The webhook seems to be sending data correctly, but I’m not sure if Mautic is processing the events as expected.

Has anyone successfully configured SendGrid webhooks for bounce handling in Mautic? Any insights on debugging or best practices for ensuring the webhook is correctly interpreted by Mautic?

 ![Capture](https://us1.discourse-cdn.com/flex020/uploads/mautic/original/2X/4/464dd51c52224805ba1461f728b0f13fd0edba9f.png)