Title: Sendgrid 400 error Bad
Last modified: May 22, 2026

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# Sendgrid 400 error Bad

 *  [tbvdg](https://wordpress.org/support/users/tbvdg/)
 * (@tbvdg)
 * [7 hours, 25 minutes ago](https://wordpress.org/support/topic/sendgrid-400-error-bad/)
 * Hi,
   Getting a 400 as described in the other thread, however it’s Sendgrid this
   time. Happening with 3.9.1 & 3.9.2. I am able to use Other SMTP in 3.9.1 and 
   enter the connection details manually as a workaround. This workaround doesn’t
   work in 3.9.2.ERROR PostmanWpMail: Exception code=0 message=Code: 400, Message:
   Bad Request, Body: #015#012400 Bad Request#015#012#015#012400 Bad Request#015#
   012#015#012

Viewing 2 replies - 1 through 2 (of 2 total)

 *  [solutioinc](https://wordpress.org/support/users/solutioinc/)
 * (@solutioinc)
 * [7 hours, 20 minutes ago](https://wordpress.org/support/topic/sendgrid-400-error-bad/#post-18916467)
 * Also having 400 issues using Brevo. I have several issues actually:
   1. Latest
   email did not send.2. When viewing the email logs page I get the following error,
   and the logs don’t load:DataTables warning: table id=ps-email-log – Ajax error.
   For more information about this error, please see [http://datatables.net/tn/7](http://datatables.net/tn/7)
   3. When visting the settings page, I get this error:
 * An unexpected error occurred {
   “readyState”: 4,“responseText”: “0”,“status”: 
   400,“statusText”: “error”
 * —
 * Edit: Rolled back to 3.9.0 and can access the log. The error for the email that
   didn’t send is:
   Code: 400, Message: Bad Request, Body: {“code”:”invalid_parameter”,”
   message”:”Unsupported file format: webp”}
 * Using Post SMTP Version 3.9.2
    -  This reply was modified 7 hours, 19 minutes ago by [solutioinc](https://wordpress.org/support/users/solutioinc/).
    -  This reply was modified 7 hours, 15 minutes ago by [solutioinc](https://wordpress.org/support/users/solutioinc/).
 *  [onemast](https://wordpress.org/support/users/onemast/)
 * (@onemast)
 * [6 hours, 3 minutes ago](https://wordpress.org/support/topic/sendgrid-400-error-bad/#post-18916495)
 * Same with Elastic mail. All emails fail with their API with the recent updates.

Viewing 2 replies - 1 through 2 (of 2 total)

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## Tags

 * [bad request](https://wordpress.org/support/topic-tag/bad-request/)

 * 2 replies
 * 3 participants
 * Last reply from: [onemast](https://wordpress.org/support/users/onemast/)
 * Last activity: [6 hours, 3 minutes ago](https://wordpress.org/support/topic/sendgrid-400-error-bad/#post-18916495)
 * Status: not resolved