All systems are operational
Maintenance
US IMAP email server downtime

On 22 July 2026 at 10:00 am US/Central time (UTC -5) one of our US IMAP email servers will be shut down for infrastructure maintenance. The server will be offline during the maintenance and the expected downtime is 6 hours.

Affected customers will be notified individually via email.

No incoming mail will be lost while the server is offline. Mail that arrives during the maintenance will be deferred and delivered once the mail server is back online.

We realize that the timing of this relocation is not ideal. If you have business-critical mailboxes and would like them to be available during the maintenance then please email support@opalstack.com or reply to this message to make arrangements to have your mailboxes migrated to a different IMAP server prior to the scheduled maintenance date.

If you have any questions or concerns regarding this maintenance then please email the Opalstack support team for assistance.

Past Incidents

15th April 2020

No incidents reported

14th April 2020

No incidents reported

13th April 2020

No incidents reported

12th April 2020

No incidents reported

11th April 2020

No incidents reported

10th April 2020

Web: Dallas Opal4 load issues

Opal4 experienced a brief spike in system load between 23:40 and 23:50 UTC on Friday 10 April 2020.

The cause appears to have been high CPU usage due to a SYN flood attack.

The server is operating normally at this time. We'll continue to monitor.

  • We've seen no further load issues since our last update.

  • Opal4 has experienced two load spikes in the past 24 hours.

    During the most recent spike we were able to positively identify one of the sites causing the problem and have taken steps to prevent it from happening again.

    We'll continue to monitor.

    • 9th April 2020

    No incidents reported