Delivery Suspended Delivery Status Notification Failure

From: Delivery Suspended <info@dailyresultats.info>
Reply: Delivery Suspended <info@dailyresultats.info>
Date: Sun, 22 Jan 2023 04:01:42 +0000
Subject: Delivery Status Notification (Failure)
Your message to the following recipients cannot be delivered into our
ESP Network

Remote server returned the following error:

    550 Mailbox unavailable. The server response was: 550 5.2.1
This mailbox has been blocked due to inactivity (UserSearch)
[4.16.22.136:60551->216.27.48.9:25]

Message details: (truncated)

    Date: 2023-01-22 04:01:40
    Subject: Votre installation électrique doit être contrôlée
tous les ans
    TransactionID: 2d140h22-563h-0046-c022-hf2s2dh4124c
    Channel: SMTP API

Message body (truncated):
Version en ligne (truncated)
Reporting-MTA: (truncated) dns;mailer.mails-connekt.com

Final-Recipient: rfc822;[EMAIL_DOMAIN]
Action: failed
Status: 5.2.0
Diagnostic-Code: smtp; 550 Mailbox unavailable. The server response
was: 550
 5.2.1 This mailbox has been blocked due to inactivity (UserSearch)
 [4.16.22.136:60551->216.27.48.9:25]