Admins can configure how long messages are kept in quarantine before they're permanently deleted in anti-spam policies. Messages that have expired from quarantine are unrecoverable. For more information, see Configure anti-spam policies in EOP.

A quarantine policy can allow you to release a message or request the release of a message, but both options aren't available for the same message. A quarantine policy can also prevent you from releasing or requesting the release of quarantined messages.


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The organization can still receive mail from the blocked sender. Messages from the sender are delivered to user Junk Email folders or to quarantine. To delete messages from the sender upon arrival, an admin can use mail flow rules (also known as transport rules) to Block the message.

Messages caught by the filters are placed in quarantine for your and MSU's protection. Users will receive a Spam Notification message once a day, notifying them of any messages that have been placed in quarantine. Any legitimate mail caught by mistake can be released directly from this message or from the quarantine portal (see details below).

Users can manage most quarantined email messages based on the quarantine policy for supported email protection features. For more information about quarantine policies, see Anatomy of a quarantine policy.

Users can request the release of email messages if the quarantine policy used Allow recipients to request a message to be released from quarantine (PermissionToRequestRelease permission) instead of Allow recipients to release a message from quarantine (PermissionToRelease permission) when the message was quarantined. For more information, see Create quarantine policies in the Microsoft Defender portal.

The Block senders action adds the sender of the selected email message to the Blocked Senders list in the mailbox of whomever is signed in. Typically, this action is used by end-users if it's available to them by quarantine policies. For more information about users blocking senders, see Block a mail sender

The organization can still receive mail from the blocked sender. Messages from the sender are delivered to user Junk Email folders or to quarantine. To delete messages from the sender upon arrival, use mail flow rules (also known as transport rules) to Block the message.

If you don't release or delete the file from quarantine, the file is removed from quarantine after the default quarantine retention period expires (as shown in the Expires column), but the blocked file remains in SharePoint or OneDrive in the blocked state.

3. From the menu on the right-hand side of your screen there are several options to choose from. You should select the 'Preview message' option to ensure the email is genuine before releasing the message. Once you are happy the email is legitimate and safe to release, select the blue 'Release message' button.

By the end of this blog, you should have a pretty good idea of how Office 365 works and how to set it up for your organization. With a strong quarantine policy, the days of the Nigerian prince emailing your users personally will dwindle far and in between.

I have noted that if we release an email that's quarantined for this reason, and replies go back and forth for the same email, then those replies don't appear but sometimes a new email doesn't appear.


Clicking on the quarantine link goes to the classic exchange console > protection > quarantine. Can't see the email here, even when following the next two steps and doing an advanced search using the message id.

So, I raised a MS support case and the support tech asked me to get screenshots of the missing email. So I went into quarantine again to get the screenshots and behold, the email was there! This was the following day after it should have been there originally and I had checked that morning as well.

I tested with a user today, from her email, I access Opens a new window. I can view all quarantined emails sent to her mailbox. I can also release it. Microsoft mentioned this is not for high-confident phishing emails. However, this is unsafe in my opinion, so I quickly created a policy to limit their access to view/preview/block/delete only. If end users need to release, they have to request IT.

I saw this when we first migrated to O365, but I was perfectly fine with users releasing their own spam/bulk email. The high-confidence phishing stuff still got delivered to the quarantine that only an admin could act on, so I was fine with that. We're on Proofpoint now, so it doesn't matter as much. Users have the ability to release their own spam/bulk mail from Proofpoint, too, and that's fine with me as well. I do NOT want to have to review every single message detected as spam, so I'm fine just leaving the "basic" stuff to the users to muddle through.

The Sale team complaints about missing emails due to quarantine. The solution my boss suggested is to give them a list of quarantined emails everyday, they will check and ask IT to release what they think are false positives:

Optionally, users may want to add a sender or sender domain to their Safe Senders list in Office 365 to ensure e-mails from the sender are not quarantined. Steps to add Safe Senders are provided below.

The user also can view their spam quarantine page. This page allows end users to view their email which is currently in quarantine via a web-based interface using their Office 365 credentials. Users can choose to release an email from quarantine and have it delivered to their inbox from the spam quarantine page.

End users can add specific users or domains to a safe sender and recipients or a blocked sender list by configuring your junk email settings in Microsoft OWA or Outlook client. Note: messages that are sent from blocked senders are marked as spam, not rejected, meaning that they can be retrieved from the Junk Email folder or quarantine.

Release: For spam (not phishing) messages, you can release the message here without going to Quarantine the Security & Compliance Center. To ensure the sender is not quarantined in the future you can add the user to your safe sender list once released from quarantine. For more information see Prevent Trusted Senders From Being Blocked

After some digging into the issue, we found that these clients were using Microsoft 365, which has been quarantining our emails. We aren't sure why this is happening, as any emails not sent from Hubspot get recieved.

We've been running into this too and SPF alignment is our latest issue after getting HubSpot's SPF added to our Gmail SPF. Unfortunately, during this process we've seen a big drop in our Google Page Rank that is directly related to the SPF failures we're seeing only with emails from via HubSpot marketing.


Where can we find more about this add-on for a custom mail-from domain? It doesn't show up anywhere in the Dmarc or SPF help docs.

The strangest thing about it is that Microsoft 365 doesn't always stop the emails. My company recently sent out a email to promote a webinar we are hosting. But when I sent a reminder email a few days ago to those who had signed up, I found that a few of them had been quarantined while others went straight to their inbox. These same people had gotten the first email with no issue.

IMPORTANT NOTE: This method previously worked for phishing simulations. However Microsoft now block quarantine bypass mail flow rules on any email flagged as a "High Confidence Phish". Microsoft introduced Advanced Delivery to help ensure delivery of phishing simulations, you can find instructions to set that up here.

The Office of Information Technology has recently implemented additional security features to the UCO email system that may impact how you interact with your email on a daily basis. The growing volumes of unwanted spam, socially-engineered phishing, variants of ransomware and other malware, as well as targeted attacks from adversaries of all kinds, require this additional level of security to help shield UCO users and their data.

OIT has implemented Microsoft Defender to assist with the evaluation of incoming and outgoing email messages for potential threats. A separate quarantine space has been created for each unique UCO Faculty and Staff email address and messages that have been identified as potential spam, phishing or malware will be routed to that address's quarantine. When that occurs, you will receive an email, similar to the one displayed below, providing you with options for managing that individual email. Additionally, you can visit your quarantine at any time by visiting and logging in with the email address and password used to access that e-mail address's inbox.

Quarantined emails can either be released to continue their journey to your regular inbox or deleted from the system completely. The instructions below will provide details on managing your quarantined mail from your email inbox and your quarantine space. Visit the Frequently Asked Question section if you have general questions about the system or the changes that have been made.

The following image is an example of an email you may receive from Microsoft Defender detailing the number of messages that are currently in quarantine. The email will provide a report of all the emails in quarantine including their Subject, Received Date, and the Sender (From:). ff782bc1db

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