Mail: Unreliable error reporting from mailer-daemon@mail.zoho.com: => Error in mail delivery announced although person received the mail ( Undelivered Mail Returned to Sender)

Hello,

The last 2 weeks I have received more than 10 mails from mailer-daemon@mail.zoho.com reporting an error in a mail delivery.

Since this is very annoying, I have checked the delivery with a few recipients and all confirmed they had received the mail.

As you can imagine this is very annoying and I am wondering if your mail service is really reliable?

Can you please let me know what you will do about this because I'm working for my business activities with Zoho mail and I cannot expect the mail work irregularly.

Many thanks for your quick reaction,

Best Regards

Frederic Ide

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v.goethals@janson.be INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :5.7.1 <v.goethals@janson.be>... Relaying denied

Received:from mail.zoho.com by mx.zohomail.com
with SMTP id 1485968650514145.3510785782537; Wed, 1 Feb 2017 09:04:10 -0800 (PST)
Message-ID:<159faa230eb.cec99edd42734.7354282587900050997@bloom-it.be>
Date:Wed, 01 Feb 2017 18:04:10 +0100
From:Frederic Ide <frederic@bloom-it.be>
User-Agent:Zoho Mail
To:"vgoethals" <v.goethals@janson.be>
Subject:Bloom it - Facture février '17
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