Emails not cannot receive messages

Emails not cannot receive messages

Hello and good day to you.

Here is the deal.  The day before yesterday about 5PM everything with the emails was working correctly. Now at emails :

  1. client@apex11.com
  2. sales@apex11.com
  3. plovdiv@apex11.com
  4. magazin@apex11.com
  5. apex11@apex11.com
I get the following error message when i try to send an email to any of those

This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error.

client@apex11.com INVALID_ADDRESS



Reporting-MTA: dns; mx.zohomail.eu
Arrival-Date: Fri, 12 Mar 2021 10:04:26 +0200

Original-Recipient: rfc822; client@apex11.com
Final-Recipient: rfc822; client@apex11.com
Status: 554
Action: failed
Last-Attempt-Date: 12 Mar 2021 08:04:28 GMT
Diagnostic-Code: 5.7.1 <client@apex11.com>: Relay access denied


Received:from mail.zoho.eu by mx.zoho.eu
    with SMTP id 1615536266088156.5139928919109; Fri, 12 Mar 2021 09:04:26 +0100 (CET)
Message-ID:<17825771b66.ff148ac1405870.7258451572839494894@apex11.com>
Date:Fri, 12 Mar 2021 10:04:26 +0200
From:t <sales@apex11.com>
To:"Bonka" <client@apex11.com>
Subject:test
Content-Type:multipart/alternative;
    boundary="----=_Part_1372196_1432261308.1615536266086"
User-Agent:Zoho Mail
ReplyReply AllForwardEdit as new




  • DI



I also tried to send from my personal email (st.stanchev@zoho.com - love ZOHO :) ) to any of the above mentioned and every time i get the error that the email is invalid, but it exist and can send with no problems. I double checked the sending for any of them. Each email is sending mails with no troubles, and they are delivered to the destination.

any ideas ?

Using desktop Zoho Mail for Windows 10