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Sometimes Not receiving email

I am using Outlook 360 for the domain Recently I have been receiving many complaints from many persons that they are not able to send email to me. Sometimes I am getting emails, but most of the times I am not getting emails which is causing a severe concern for our operations.


For example:

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. The following address(es) failed:
host []
SMTP error from remote mail server after RCPT TO:<>:
550 5.1.1 <> Recipient not found. <>



From: Mail Delivery Subsystem <>
Date: 22 March 2018 at 10:00:13 AM GMT+3
Subject: Delivery Status Notification (Failure)

Address not found
Your message wasn't delivered to because the address couldn't be found, or is unable to receive mail.

The response from the remote server was:
550 5.1.1 <> Recipient not found. <>


Hi @Barayan,

Sorry for the delayed response. If you still need assistance regarding your issue please reach out to our support team. 

KayJay - GoDaddy | Community Moderator
24/7 support available at