Email held in quarantine? Release it yourself

What quarantine is. Our email filter checks every incoming message. Anything that looks like spam, phishing or malware is held in quarantine instead of reaching your inbox. Held messages are kept for a limited time, usually 15 to 30 days, then deleted for good.

The quarantine notice. You may get an email notice from Microsoft 365 listing messages held for you, with buttons to review or release them.

How to release a message

1. Open the notice, or go to security.microsoft.com/quarantine and sign in with your work account.
2. Select the message and check the sender and subject. The Expires column shows when it will be deleted.
3. Select Release. The message arrives in your inbox within a few minutes. For some messages, such as suspected malware or high-risk phishing, you'll only see Request release; we'll review those for you.

Release it only if all three are true: you know the sender, you were expecting the message, and nothing about it seems odd. If you're unsure, leave it held and contact us.

Watch for fake notices. Scammers sometimes send fake quarantine notices to steal passwords. A real notice never asks for your password. If you're not sure a notice is real, don't use its links: go to security.microsoft.com/quarantine yourself, and report the email using Report > Report phishing.

A trusted sender keeps getting held? Email support@deepnet.com with the sender's address and we'll review it. We'll allow them if it's safe to, so you don't have to release their emails every time.