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

25th November 2019

Email: USA US MX server blacklisted by Cloudmark

mx1.us.opalstack.com is presently blacklisted by Cloudmark. As a result, email forwarded to domains that use Cloudmark services may be delayed or bounced.

We're presently working with Cloudmark to have the server delisted and will update this incident when more information is available.

  • The MX server has been delisted.

  • We believe the blacklisting happened due to an influx of spam that was subsequently forwarded to external forwarding targets for various customers. We've removed the spam from our mail queue and are standing by for the server to be de-listed.

    • Dashboard Control panel issue

    At around 7AM UTC on 25 November 2019 a problem developed with the API tokens used by the control panel. As a result, mail users and other items added via the control panel after that time may not have been created correctly.

    The token issue is resolved. If you notice any problems with mail users, shell users, applications, and other items created via the panel in the past 24-36 hours then please contact our support team for assistance.

    24th November 2019

    No incidents reported

    23rd November 2019

    No incidents reported

    22nd November 2019

    No incidents reported

    21st November 2019

    No incidents reported

    20th November 2019

    No incidents reported

    19th November 2019

    No incidents reported