All systems are operational
Maintenance
Scheduled US IMAP email server downtime

On 26 August 2026 at between 11:00 am and 4:00 pm US/Pacific time our network team will be performing infrastructure maintenance. During this 5-hour window, network connectivity to one of our US IMAP/POP3 email servers will be interrupted for up to 1 hour.

As a result, some customer mailboxes will be unavailable for up to 1 hour during the network interruption. Customers who will be impacted by the interruption have been emailed directly.

No incoming mail will be lost during the interruption. Mail that arrives during the interruption will be deferred and delivered once connectivity to the mail server is restored.

Email forwarding and SMTP services will not be affected, however messages sent via SMTP during the interruption will not be stored as sent mail in IMAP folders on the server.

We'll update our status page at http://status.opalstack.com/ at the beginning of the maintenance window. To be informed of system status updates automatically please subscribe at https://status.opalstack.com/subscribe.

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

Past Incidents

7th March 2025

No incidents reported

6th March 2025

No incidents reported

5th March 2025

No incidents reported

4th March 2025

No incidents reported

3rd March 2025

Email: Germany DE SMTP blocked by iCloud

At the present time email sent to @icloud.com addresses via our DE SMTP server is being either deferred or bounced. We're working with Apple to resolve the issue and will update this post when more information is available.

In the meantime, DE mail customers can work around the issue by using our alternate DE SMTP server in their email client settings. The alternate server is: smtp2.de.opalstack.com

  • The block was cleared as of 14:22 UTC today. Mail sent to iCloud email addresses via our DE SMTP are no longer bouncing.

  • Apple informed us that our SMTP is caught up in a block of a larger IP address range operated by our network provider. Our provider is working with Apple to resolve the issue.

    If you are affected by this you can configure your mail client to use smtp2.de.opalstack.com as its SMTP server as a temporary workaround.

  • Apple informed us that our SMTP is caught up in a block of a larger IP address range operated by our network provider. Our provider is working with Apple to resolve the issue.

    If you are affected by this you can configure your mail client to use smtp2.de.opalstack.com as its SMTP server as a temporary workaround.

    • 2nd March 2025

    No incidents reported

    1st March 2025

    Web: San Francisco opal3 not responding

    opal3.opalstack.com (San Francisco shared hosting) is currently not responding. We're investigating.

  • We identified an abusive IP address that was flooding the network connection. The IP has been blocked and the server is now responding.