Is Mimecast Down?
Reachable from all 8 checked regions
Average response time: 710ms
Last checked · checks run every 6 hours
Official status page: https://status.mimecast.com
Mimecast uptime
Measured from multiple regions every 6 hours. Percentages count only checks that returned an availability answer — 18 days measured so far. A dash means that window does not yet hold enough measured days to publish a figure.
30-day history
18-day clean streakReachability by region
Each region runs its own request from a different part of the world. A service can be up for one continent and down for another, which is usually the first sign of a routing or CDN problem.
What Mimecast does
Mimecast sits in front of an organisation's email, filtering inbound messages for spam, phishing and malware before they reach Microsoft 365 or Google Workspace, and archiving what passes. It also provides URL and attachment protection, remediation tools and security awareness training. Because it sits in the mail path rather than beside it, an incident affects delivery itself rather than one feature of a mailbox.
What an outage looks like
Inbound mail stops arriving while the mailbox itself works, so Outlook looks healthy and simply goes quiet. Outbound messages queue or return delivery delay notices. Links rewritten by URL protection fail to open, attachments stay held in scanning, and the administration console is unreachable for releasing held mail. Mimecast runs separate regional grids, so one region can be degraded while the others deliver normally.
What to do about it
Check status.mimecast.com and find your grid first: the US, US B, UK, South African, Australian, German, Canadian and Offshore grids are reported separately, each with its own Email Processing, Threat Protection, Web Security, Authentication and Administration Console components. Mail addressed to a queued service is generally retried by the sending server rather than discarded, so wait before asking senders to resend and create duplicates.
Is it down for everyone, or just you?
If this page says Mimecast is up but it is not loading for you, the problem is between you and them. Run a check against any URL from all 18 regions to find out where it breaks.
Related services
Mimecast outage FAQ
Is my email lost during a Mimecast outage?
Which Mimecast grid am I on?
Does a Mimecast outage mean Microsoft 365 is down?
Why do links in old emails stop working?
Can I still release a message from quarantine?
How we measure this
- We request Mimecast's public endpoint every 6 hours from Fly.io regions across six continents — 8 of them answered the most recent check.
- A region counts as down only when it gets no usable HTTP response. A
403or429means the origin answered and refused us, which we report as blocked, never as an outage. - A single failing region is treated as probe noise. We only change the verdict when two consecutive cycles agree.
- Response times average only the regions that actually served the page, so a timeout never inflates the number.
- Where Mimecast publishes an official status feed we read it too. An all-clear from the vendor can soften an unconfirmed degradation; a vendor-declared outage only worsens our verdict when our own checks corroborate it.
Get alerted when Mimecast goes down
This page refreshes every 6 hours. Your own monitors run as often as every 30 seconds, from the same 18 regions, and tell you the moment something breaks.
Start Free Monitoring