If you have ever not received an email that you know was sent but did not bounce back to the sender, it might be that check-office365-email-quarantinethe backend server has marked it for deletion and put in the Quarentine.  Microsoft, and all good companies, have email filtering that saves you from the most aggressive spam.  In Microsoft Office365’s case, the default settings will block about 75% of your spam because Microsoft’s servers know that:

  1. Many others have already reported this same message as spam
  2. The sending server is ‘blacklisted’
  3. The message uses obfuscation techniques like s3x and p()rn which human can still read but spam filters have trouble with

Regardless, it is a good idea to look into your Office365 email quarantine from time to time and it is easy to do.  Just surf to: https://admin.protection.outlook.com/Quarantine sign in and do what is obvious.

If you are an company email administrator, you can use the office364 admin portal to find the quarantined email messages for the whole company:

  1. Sign into https://portal.office365.com/
  2. Scroll down and expand ADMIN CENTERS (from the menu on the left)
  3. Click EXCHANGE
  4. Click PROTECTION (from the menu on the left)
  5. Click QUARANTINE (from the options along the top)




Mansour · October 2, 2018 at 7:06 am

What type of access permission need to grant Help-Desk to trace and release quarantined message?

Thank you,

    Ian Matthews · December 11, 2018 at 7:06 pm

    I would call MS support (yes, it is free for O365 questions) to answer that detail:

    In the United States, call 1 800 865 9408.

    In Australia, call 1 800 197 503.

    In Canada, call 1 800 865 9408.

    In the United Kingdom, call 0800 032 6417.

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