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Is Mimecast down right now? Live status and outage tracker

No, Mimecast is up.

No outage detected, and no user reports in the last hour.

Live Updated 2 min ago Data refreshes every 5 minutes

Not working for you? Official status pageStatus page

User reports, last 24 hours, 15 minutes a segment: 96 flowing 0 slow (elevated) 0 jammed (outage)

User reports, last 24 hours

No reports in this window

No problem reports came in for Mimecast in the last hour, and at this time of day there are usually almost none. There has been no spike in reports since 28 October. These are user reports from the US, where most people report Mimecast problems.

Around the world right now: normal in 18 other countries. By country

NormalClose to the usual level24 h · 0 reports
ElevatedMore than 1.5 times the usual levelNone in this chart
OutageMore than twice the usual level and far above the day's averageNone in this chart
Usual levelWhat a usual day sees at that timeAlmost none at this time of day

Reports, last hour

Quiet

Uptime, 24 h

100.00%

No outage windows

Last outage

None

In the last 24 hours

Busiest 15 minutes

No reports

Last 24 hours

Mimecast outages and problems

No user reports came in for Mimecast in the past 24 hours, and its uptime over that window is 100.00%.

No 15-minute window had any reports at all, so the chart above stays flat.

No problems detected in the last 24 hoursReports for Mimecast stayed at their usual level the whole time.

This month

Mimecast in October 2026

Problem reports in October (since 28 October): 19

Monthly report for October 2026

What went wrong

What people said was wrong in recent problem reports for Mimecast worldwide.

Login50%
Website50%

Share of 2 recent reports that said what was wrong, from every country listed below.

World map

Mimecast reports around the world

In the last 24 hours, 9 problem reports about Mimecast came in from 3 countries. Right now reports are at the usual level in every country.

Outage now
Problems now
Normal

Each dot is a group of recent reports, coloured by how its country is doing now; bigger dots, more reports.

Country	Now	24 hours
The US numbers above	Normal	7
Mexico	Normal	1
Japan	Normal	1
The Netherlands	Normal	0
Germany	Normal	0
Belgium	Normal	0
The UK	Normal	0
France	Normal	0
Italy	Normal	0
Spain	Normal	0
Canada	Normal	0
Australia	Normal	0

Each country's status compares its reports with the usual level there. 7 more countries had 0 reports in the last 24 hours. Map outlines: Natural Earth.

Last 30 days

Mimecast problem spikes, last 30 days

Since 28 October, Mimecast had no outage spikes or periods of elevated reports.

By country

Each square is one day in the countries with the most reports: red when reports stayed at outage level for half an hour or more, amber when they stayed above the usual level for an hour or more, grey otherwise.

The US19
Japan2
Belgium1
The UK1
Mexico1
South Africa1
Austria0
Australia0

Country history starts on 28 October 2026. Days run from midnight to midnight, Central European time.

A spike is a sharp rise in problem reports from users, kept exactly as this page showed it at the time. This history starts on 28 October 2026. Monthly reports for all services

Troubleshooting

How to fix Mimecast not working

Mimecast is up on our end, so if it won't work for you, the problem is most likely on your side. Work through these in order:

Your browser tries to reach mimecast.com over your own connection, right now. Nothing is sent to us or stored.

Check the Mimecast status page
Open the official status page. Check service health for login and email delivery; if an incident is active, wait for it to clear.
Sign out and back in
Sign out of the Mimecast Personal Portal, then close and reopen your browser. If you see a session expired or access denied message, clear the site's cookies and cached files before you sign in again.
Re-enable the Outlook add-in
In classic Outlook, open File > Options > Add-ins. Set Manage to COM Add-ins, click Go, find Mimecast for Outlook, and check its box if it is unchecked. Restart Outlook; if it still does not load, check Disabled Items.
Release held messages
Sign in to Mimecast Personal Portal and open Held Messages or Quarantine. Review the message and release it if it is legitimate. If it is missing there too, ask your email admin to check Message Tracking for your address.

While Mimecast is down: what to use instead

Microsoft Teams You chat; mail queues.
Outlook on the web Open Outlook on the web to send internal mail and read inbox items that arrived although the Mimecast add-in stays stuck for you at work.
Microsoft Defender for Office 365 IT checks Defender quarantine when legit mail vanishes before delivery for you.
Proofpoint Email Protection Admin routes mail through Proofpoint awhile because you still send mail while its quarantine holds spam.

Your device

Fix Mimecast on Windows, Mac, Android and iPhone

Mimecast on Windows

Fix: Restart the Mimecast Services on your PC or disable and re-enable the Mimecast Outlook Add-in. If using the web portal, clear your browser cache and cookies.
Check: Check if the Mimecast Outlook Add-in status icon is red or showing connection errors. Alternatively, try logging into the Mimecast Personal Portal via a web browser to see if the service loads.

Command Prompt

ping mimecast.comTest whether Mimecast's servers reply

nslookup mimecast.comCheck that Mimecast's DNS resolves

tracert mimecast.comTrace where the connection drops

ipconfig /flushdnsClear the DNS cache, then reload

Mimecast on Mac

Fix: Update the Mimecast for Mac app or your Outlook add-in to the latest version. If the web portal is unresponsive, try using an incognito browser window or clearing your Safari or Chrome cache.
Check: Look for sync error alerts in the Mimecast for Mac app or check the connection status in your menu bar. You can also attempt to log into the Mimecast Administration Console via your web browser.

Terminal

ping -c 4 mimecast.comTest whether Mimecast's servers reply

nslookup mimecast.comCheck that Mimecast's DNS resolves

traceroute mimecast.comTrace where the connection drops

sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponderFlush the macOS DNS cache, then reload

Mimecast on Android

Fix: Clear the Mimecast Mobile app cache and data in your device settings, or reinstall the app from the Google Play Store. Ensure your device is not blocklisted by your organization's Mimecast administrator.
Check: Open the Mimecast app and check if it hangs on the login screen or displays authentication errors. You can also check if other work apps are unable to connect to the internet.

Mimecast on iPhone and iPad

Fix: Offload and reinstall the Mimecast app from the Apple App Store, and ensure you have accepted the latest profile configuration if required by your IT department. Restarting your iPhone can also resolve credential caching issues.
Check: Check if the Mimecast app displays connection timeout errors or fails to authenticate. Verify if you can access the Mimecast cloud services using Safari.

About

What happens when Mimecast goes down

Mimecast is an email security and archiving service that many organizations rely on to filter inbound mail, scan attachments and links, and keep searchable copies of messages for Microsoft 365 and Google Workspace. An outage interrupts mail flow and quarantine releases; it can also block access to the Mimecast portal for IT teams and employees who need it.

During an outage you may see inbound mail delayed or rejected, outbound messages stuck in a queue, sign-in failures on the Mimecast portal, and an Outlook add-in that will not load or report spam. Mail flow and portal access usually break first because those are the paths most people touch. Problems can be regional or limited to one feature, so one team may have delayed delivery while another gets normal service. The status at the top of each page shows whether problem reports from people using it are above their usual level, counted in 15-minute windows over the last 24 hours; the site does not ping, probe, poll, or monitor the service, and it never checks from multiple locations.

Servers and network

Mimecast IP address, servers and network

Checking mimecast.com from our server…

Questions

Mimecast FAQ

Is Mimecast down right now?

The status at the top of this page shows whether user problem reports for the service are above their usual level, counted in 15-minute windows over the last 24 hours. This site does not ping or probe the service, so if the official status page is listed above, check it for provider updates. If only your mailbox or one device is failing while coworkers on another network are fine, the problem is likely on your side. Try a different network or sign out and back in, then ask your IT admin if only your account is affected.

Why does the Mimecast for Outlook add-in show a login or connection error?

The add-in can lose its session when Outlook or your network changes, and the symptom is usually a stuck sign-in prompt or a message that it cannot reach the service. Restart Outlook first, then sign out and back in from the add-in; if your org uses single sign-on, open Outlook on another network to see if the problem follows your device. If it works elsewhere, your machine or mailbox profile is the likely cause.

Why are my emails held in Mimecast quarantine?

Messages get held when a policy or threat scan flags them, and you may see a held message notification or a digest from your admin. Open the personal portal or ask your IT admin to review the held message, then release it if it is safe. If legitimate mail keeps landing there, your admin can adjust the policy or allow the sender.

Why can't I log in to Mimecast Personal Portal?

Login failures usually come from an expired password, a broken single sign-on redirect, cached session data, or the wrong portal address. Try the direct portal address your admin gave you, or open it in a private browser window to rule out cached session data. If your company uses SSO, your identity provider may be the one blocking access, so test another SSO app.

Why is my Mimecast archived email search missing recent messages?

Archive search can lag behind delivery, especially after a mailbox restore or a large send. If only one folder or sender is missing, check whether the message was held, deleted, filtered by a rule, or sent from an app that does not journal mail. Your admin can check the archive ingestion logs and the retention policy for that mailbox.

For your site

Put the Mimecast status badge on your site

Paste one of these into a web page, a blog post or a README. The badge shows the same status as this page, based on user problem reports. Browsers can keep a copy for up to 4 hours. It links back here.

HTML

<a href="https://isitdownrightnow.app/services/mimecast/"><img src="https://isitdownrightnow.app/badge/mimecast.svg" alt="Mimecast status" height="20"></a>

Markdown, for README files

[![Mimecast status](https://isitdownrightnow.app/badge/mimecast.svg)](https://isitdownrightnow.app/services/mimecast/)

The badge is a plain image: no scripts, no cookies. People who see it on your page load it from our server.

How we track Mimecast

The status on this page comes from user-submitted problem reports for Mimecast, counted in 15-minute windows over the last 24 hours. Each window is compared with the normal level for Mimecast, so a few complaints on a quiet day don't trigger anything, but a sudden jump well above normal does.

When reports climb well above normal, the status here changes to partial outage or major outage and the chart moves with it. This is separate from Mimecast's official status page: user reports tend to show a problem early, while the official page confirms the cause. If the two disagree, check both.