# Issue with SendGrid Webhook Callback in Mautic 5: DSN Configuration for Event Processing / "Transport Not Found" Error – Does Mautic 5 Support This by Default or Is a Plugin Required?

**URL:** <https://forum.mautic.org/t/issue-with-sendgrid-webhook-callback-in-mautic-5-dsn-configuration-for-event-processing-transport-not-found-error-does-mautic-5-support-this-by-default-or-is-a-plugin-required/34939>\
**Category:** Mautic 5 Install/Upgrade Support\
**Tags:** community, development, email\
**Created:** [February 5, 2025, 10:57am UTC](https://forum.mautic.org/t/issue-with-sendgrid-webhook-callback-in-mautic-5-dsn-configuration-for-event-processing-transport-not-found-error-does-mautic-5-support-this-by-default-or-is-a-plugin-required/34939 "2025-02-05T10:57:12Z")\
**Posts on this page:** 4\
**Page:** 1

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**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:** [February 5, 2025, 10:57am UTC](https://forum.mautic.org/t/issue-with-sendgrid-webhook-callback-in-mautic-5-dsn-configuration-for-event-processing-transport-not-found-error-does-mautic-5-support-this-by-default-or-is-a-plugin-required/34939/1 "2025-02-05T10:57:12Z")

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**Your software**  
My Mautic version is:5.4.35  
My PHP version is:8.1.2  
My Database type and version is:

**Your problem**  
My problem is:  
I have configured SendGrid in the email DSN settings.  
In my SendGrid account, I set up the webhook for events like open, click, and bounce using the URL: `mautic_domain/mailer/callback`.

I enabled debug logging for requests, and the logs are coming through perfectly in Mautic. However, in the response, I am encountering the following error:

**Error** : “No email transport that could process this callback was found.”

This error appears in the logs.

Additionally, in Mautic 5, does it support the `mautic_domain/mailer/callback` for events like open, click, and bounce directly, or do I need to install a plugin for this functionality?  
Or do I need to change the email DSN settings to ensure that Mautic can recognize the transport in the `mautic_domain/mailer/callback`?

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<div class="post-metadata">

**Author:** ![mauticdeveloper](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/mauticdeveloper/32/627_2.png) [@mauticdeveloper](https://forum.mautic.org/u/mauticdeveloper)\
**Post date:** [April 15, 2025, 5:27pm UTC](https://forum.mautic.org/t/issue-with-sendgrid-webhook-callback-in-mautic-5-dsn-configuration-for-event-processing-transport-not-found-error-does-mautic-5-support-this-by-default-or-is-a-plugin-required/34939/2 "2025-04-15T17:27:23Z")

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Did you find solution to the problem?

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**Author:** ![sandrovenezuela](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/sandrovenezuela/32/9241_2.png) [@sandrovenezuela](https://forum.mautic.org/u/sandrovenezuela)\
**Post date:** [April 23, 2025, 6:58pm UTC](https://forum.mautic.org/t/issue-with-sendgrid-webhook-callback-in-mautic-5-dsn-configuration-for-event-processing-transport-not-found-error-does-mautic-5-support-this-by-default-or-is-a-plugin-required/34939/3 "2025-04-23T18:58:46Z")

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I am not yet using Mautic 5 in production and I intend to start testing it soon.

From what I understand, Mautic does not support callbacks and to solve this you need to install the feature via composer.

This page has more details: [Webhook (Symfony Docs)](https://symfony.com/doc/current/webhook.html)

I tried, but unfortunately I was not successful in installing it.

I believe that one option would be to use N8N to receive the SendGrid webhook, or any other, then process the data and update the contact in Mautic.

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**Author:** ![alexzlobin](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/alexzlobin/32/13606_2.png) [@alexzlobin](https://forum.mautic.org/u/alexzlobin)\
**Post date:** [February 24, 2026, 2:55pm UTC](https://forum.mautic.org/t/issue-with-sendgrid-webhook-callback-in-mautic-5-dsn-configuration-for-event-processing-transport-not-found-error-does-mautic-5-support-this-by-default-or-is-a-plugin-required/34939/4 "2026-02-24T14:55:33Z")

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Hi everyone

I’ve built a new plugin inspired by (and based on the approach of) the Amazon SNS callback plugin by **@matbcvo** :

Reference project: matbcvo/mautic-amazon-sns-callback

My plugin repository: AlexanderZlobinM1/SendgridCallBackBundle

I’d really appreciate it if you could install it, test it in your environment, and share any feedback — bugs, logs, edge cases, and feature requests are all welcome

Thanks in advance!

> **[GitHub - AlexanderZlobinM1/SendgridCallBackBundle](https://github.com/AlexanderZlobinM1/SendgridCallBackBundle)**
>
> Contribute to AlexanderZlobinM1/SendgridCallBackBundle development by creating an account on GitHub.