hell

today we have problem sending emails on specific domain like:

gabrijel.com, belimed.com  or  kovintrade.si

-----Original Message-----
From: mailer-daemon@mail.zoho.eu <mailer-daemon@mail.zoho.eu>
Sent: Tuesday, September 29, 2020 10:51 AM
To: info@vovk-inox.si
Subject: Mail Delivery Status Notification (Delay)

This message was created automatically by mail delivery system.

THIS IS A WARNING MESSAGE ONLY.

YOU DO NOT NEED TO RESEND YOUR MESSAGE.

The original message was received at Tue, 29 Sep 2020 10:50:52 +0200  from
info@vovk-inox.si [info@vovk-inox.si]

    ----- The following addresses had fatal errors -----   
   [nabava@gabrijel.com, matjaz.modec@gabrijel.com]

Message will be retried for 4 more day(s)

what shoul we do, thanks for helping us

LP