All systems are operational
Maintenance
Scheduled DE IMAP/POP3 email server downtime

On 24 September 2026 at between 07:00 am and 10:00 am UTC our network team will be relocating one of our mailbox storage servers to a new location within the data center.

The server will be offline during the relocation. As a result, some customer mailboxes will be unavailable for up to 3 hours during the relocation. Affected customers will be notified directly via email.

Affected customers will not be able to check their email for affected mailboxes during the relocation.

No incoming mail will be lost during the relocation. Mail that arrives during the relocation 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 relocation will not be stored as sent mail in IMAP folders on the server.

Customer websites will not be affected by the relocation.

We realize that the timing of this relocation may not be ideal. Customer who would like to have their mailboxes migrated to a different server in advance of the server relocation should contact the Opalstack support team to make the necessary arrangements.

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 email our support team and someone from our team will get back to you as soon as possible.

Past Incidents

8th January 2022

No incidents reported

7th January 2022

No incidents reported

6th January 2022

No incidents reported

5th January 2022

No incidents reported

4th January 2022

No incidents reported

3rd January 2022

Email: Germany German SMTP blocked by Microsoft

On January 3 2022 at 20:47 UTC Microsoft began blocking mail sent from smtp.de.opalstack.com to domains that use the Microsoft 365 email system.

Microsoft's own IP reputation and junk mail reporting systems indicate that there are no problems with smtp.de.opalstack.com so we've reached out to them for answers.

We'll update this post as soon as more information is available.

In the interim as a possible workaround customers may create a new mailbox on our US mail server and use that temporarily for their outgoing email authentication.

  • It's been over a week and we've seen no blocks of the new server IP by MIcrosoft, so we consider this to be resolved.

  • We informed Microsoft of our findings and the corrective action we've taken but we've still received no further communication from them.

    To work around this we've moved smtp.de.opalstack.com to a new IP address. Customers do not need to change any settings - the DNS change should propagate automatically within the hour.

    After the DNS change has propagated, customers should be able to send mail to email addresses that are hosted by Microsoft.

    We'll leave this incident open and will continue to monitor.

  • We've still not heard from Microsoft but we believe we've identified the activity that triggered the block and are taking action to mitigate it at this time.

    We'll notify Microsoft of the actions we're taking and continue to hold on for a response.

  • We're still awaiting a response from Microsoft and have reached out to them as a reminder.

    • 2nd January 2022

    No incidents reported