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

28th October 2020

No incidents reported

27th October 2020

No incidents reported

26th October 2020

No incidents reported

25th October 2020

Email: USA US SMTP blocked by outlook.com

Our US SMTP server smtp.us.opalstack.com is currently on a Microsoft block list used by the following domains and their non-US equivalents:

  • hotmail.com
  • live.com
  • msn.com
  • outlook.com

We're working to get the server delisted at this time.

  • Microsoft is no longer blocking our US SMTP.

  • Microsoft has responded saying that our US SMTP will be removed from the blacklist within the next 24-48 hours.

  • Microsoft have responded to our inquiry. It appears that the recent influx of WebFaction customers 🎉 has caused a sudden increase our outgoing mail volume and that this is what triggered the block.

    We've verified via Microsoft's own postmaster tools that there have been zero complaints regarding mail from our US SMTP and have provided this data to Microsoft for consideration.

    We hope to follow up with a resolution to this issue as soon as possible. Thank you for your patience.

    • 24th October 2020

    No incidents reported

    23rd October 2020

    No incidents reported

    22nd October 2020

    No incidents reported

    21st October 2020

    Web: multiple locations Let's Encrypt rate limit for opalstacked.com subdomains

    At this time the Let's Encrypt service is rate-limiting certificate issue and renewal requests for the entire *.opalstacked.com domain. This is the domain that we use to provide free subdomains to our hosting customers.

    We're working with the LE team to get a higher limit. In the meantime if you are attempting to issue a LE cert for a site that uses your opalstacked.com subdomain then it may fail. If this happens you'll receive a failure notice via email.

    Until the rate limit is raised then the alternative is to use one of your own registered domains on your site instead of your opalstacked.com subdomain. If you're not ready to point your domain at Opalstack, then you can create a testing subdomain and A record via your NS provider to point that subdomain at your Opalstack server.

    We'll update this issue as soon as the rate limit has been raised.

  • We've made some changes to the way Let's Encrypt works with the shared opalstacked.com domain and as a result the domain is no longer rate-limited. We'll be posting updated documentation with the details later this week.

  • Looks like we've hit our new limit, we'll get this corrected ASAP.

  • We've confirmed that our increased rate limits are in effect, Calling this fixed, thanks for your patience :-)

  • The LE service has increased our limit and at this time we are not seeing any rate-limiting for new LE certificates and renewals on any domains. We'll continue to monitor.