Email Delivery Issues to Microsoft

Resolved
Resolved

We are now seeing that the affected IP addresses have cleared from the blacklist, normal service has resumed.

We will continue to monitor and provide further updates if necessary.

Updated

We are continuing to work with Microsoft to remove the IP block affecting our anti-spam gateway. We thank you for your patience and apologise further for any inconvenience caused.

Investigating

A small amount of our customers are currently unable to email Microsoft accounts. This is due to one of our IP ranges being registered on a blacklist, which is unfortunately the range used by our anti-spam gateway. CWCS Technical Support are working to resolve this issue as soon as possible. Please accept our sincerest apologies for any inconvenience caused.

Began at:

Affected components
  • Hosted Services
    • Email Services
      • Barracuda Anti-Spam
      • Exchange Mail
      • M365