UPDATES:

10/16/2026 11:05 AM MDT - Maintenance window completed. Marked Fixed during migration to the new status page.

Scheduled Maintenance: Zimbra upgrade (Sep 17, 10:00 PM–12:00 AM MDT)

We will be performing planned maintenance on the Zimbra mail platform tonight, Wednesday, September 17, from 10:00 PM to 12:00 AM MDT.
During this window we are retiring the Zimbra 9 MTA/Proxy servers and bringing the Zimbra 10 servers online. This upgrade is part of our rolling migration to Zimbra 10.

Impact:
This will only impact our private label Zimbra Hosts.
Inbound mail will queue and deliver once services are restored.
No data loss is expected.
https://zimbra.xmission.com will NOT be affected by this.