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DDoS Attack Affected Some Emails

At around 6PM on 22nd September 2020 we became aware of a situation that meant some emails sent to some customers may not have been delivered and so were bounced back to the sender.


  • The DDoS Attack started at around 3 PM on 22nd September 2020 and was mitigated by around 1 AM on 23rd September 2020.
  • Sixteen of the domain names we host with one of our domain hosts were affected – so only some customers are impacted.
  • During the attack web sites would have been knocked offline and emails sent to you may have bounced back to the sender.


You could receive warnings (e.g. from customers, friends or suppliers) that suggest they have been unable to send you an email because an email they sent to you has bounced back. In this scenario simply have them re-send the email to you, it should be delivered to you successfully.


A distributed denial-of-service (DDoS) attack is a malicious attempt to disrupt the normal traffic of a targeted server, service or network by overwhelming the target or its surrounding infrastructure with a flood of Internet traffic. If you want a fuller explanation, look at this page.

If you have any further questions about this please call us at IT\norwich on 01603 554000.

***UPDATE 24-09-2020 @ 07:43***

Over the last 36 hours some customers would have experienced some issues, the nature of which is dependent upon the nature of their services and where they are hosted. It does seem however that from this morning all services  are back to normal as the hosts have secured their DNS servers behind the CloudFlare system which is designed to (amongst other things) detect and prevent DDoS attacks.

Please see below latest sitrep from the hosts.