# Getting the error 404 when doing the test callback to URL in the email monitor

**URL:** <https://forum.mautic.org/t/getting-the-error-404-when-doing-the-test-callback-to-url-in-the-email-monitor/18033>\
**Category:** Product Support\
**Tags:** mautic-3\
**Created:** [February 4, 2021, 9:05am UTC](https://forum.mautic.org/t/getting-the-error-404-when-doing-the-test-callback-to-url-in-the-email-monitor/18033 "2021-02-04T09:05:57Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![dirtyd](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/dirtyd/32/4427_2.png) [@dirtyd](https://forum.mautic.org/u/dirtyd)\
**Post date:** [February 4, 2021, 9:05am UTC](https://forum.mautic.org/t/getting-the-error-404-when-doing-the-test-callback-to-url-in-the-email-monitor/18033/1 "2021-02-04T09:05:57Z")

</div>

Greetings.

**My environment:**

**Server:** Digital Ocean droplet  
**OS:** Ubuntu 20.04.1 LTS (GNU/Linux 5.4.0-51-generic x86\_64)  
**PHP:** 7.3.25-1+ubuntu20.04.1+deb.sury.org+1 (cli) (built: Dec 26 2020 10:32:51) ( NTS )  
**DB:** mysql Ver 15.1 Distrib 10.3.25-MariaDB, for debian-linux-gnu (x86\_64) using readline 5.2  
**Server:** Apache/2.4.41 (Ubuntu)  
**Mautic:** 3.2.5

**My problem:**

Mautic is normally working but I can not set up for SendGrid callback. I get the error 404 when trying the test callback URL.  
Example with cURL request:

```
curl -I https://www.mautic.domain.com/mailer/sengrid_api/callback

```

returns this message:

```
HTTP/1.1 404 Not Found
Date: Thu, 04 Feb 2021 08:26:32 GMT
Server: Apache/2.4.41 (Ubuntu)
Set-Cookie: 935af385425ce4df78a248e69761515d=ckt2gl1od8lkag30gvot4njjbm; path=/; secure; HttpOnly
Cache-Control: max-age=0, must-revalidate, private
Expires: Thu, 04 Feb 2021 08:26:32 GMT
Content-Type: text/html; charset=UTF-8

```

The same message returns for all other callback URLs:

- /mailer/elasticemail/callback
- /mailer/amazon\_api/callback
- /mailer/mandrill/callback
- etc.

No errors in **/var/log/apache2/error.log**

**/var/log/apache2/access.log** contains such messages:  
“POST /mailer/sendgrid\_api/callback HTTP/1.1” 404 65014 “-” “SendGrid Event API”

**.httaccess** exists and has a default configuration.  
**site\_url** configured and **HTTPS** enforced.

**What I tried to do:**

1. Searching by forum;
2. Searching by issues of Github repo;
3. Googled.

I will be very appreciative of any help/advice. Thanks for your attention.