Keep getting Delivery Failed

Keep getting Delivery Failed

every so often i get the below. i do not understand why after several months zoho is still trying to deliver the email still. can you look into my account and see why it's still trying to deliver that and fix it? thanks

  2. Reporting-MTA: dns; mx.zohomail.eu
  3. Arrival-Date: Mon, 11 Nov 2019 17:28:43 +0000
  4. Original-Recipient: rfc822; anticorporatedemocrat@zoho.eu
  5. Final-Recipient: rfc822; democraticsocialist@zoho.com
  6. Status: 550
  7. Action: failed
  8. Last-Attempt-Date: 11 Nov 2019 17:28:54 GMT
  9. Diagnostic-Code: 


  12. ----- Transcript of session follows -----  

  14.  Return-Path:<noreply@vivaldi.net>
  15.  Received:from smtp.vivaldi.net (smtp.vivaldi.net [82.221.130.149]) by mx.zohomail.com
  16. with SMTPS id 1573493328082416.63039110677516; Mon, 11 Nov 2019 18:28:48 +0100 (CET)
  17.  Message-ID:<345da736-7ce4-515b-5a48-c8746eeb383d@vivaldi.net>
  18.  Date:Mon, 11 Nov 2019 17:28:43 +0000
  19.  From:Vivaldi Forum <noreply@vivaldi.net>
  20.  To:anticorporatedemocrat@zoho.eu
  21.  Subject:[Vivaldi Forum] Native Themes to Match the OS Design
  22.  Content-Type:multipart/alternative;
  23.  boundary="--_NmP-699fb511af838918-Part_1"

  25. P.S: Please note that your email forwarding will be disabled if there are too many failures.