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Manage blocked senders and allowed senders with MIT spam filtering

On this page:


  • How do I add an email address or domain to my "bad senders" or "good senders" list?
  • black list or white list
  • View and release quarantined messages

Context and Notes

  • It can take up to an hour for your block/allow lists to sync with the server. In the interim you may still see messages from blocked senders delivered to your inbox or messages from allowed senders delivered to your Junk folder.
  • Spam Filtering does not allow you to block senders inside your organization (with an address). A workaround for this is to use Filters.  If you believe that senders with email addresses have been caught by the spam filter, please send email to the IS&T Service Desk with full details concerning the message in question so that the it can be investigated further.  Many times, the mail appears to have been sent from a address, but was actually sent using another sending service (such as Mailchimp, Mailjet, etc.)

Manage your "blocked" or "safe" lists

With Outlook on the Web

  1. Visit and login.
  2. Open Settings (gear icon in the upper-right).
  3. Select Mail > Junk Email

  4. From this screen you can add and remove users from your blocked and safe senders lists.

With Outlook for Windows

See: Microsoft's Block or Unblock Senders

All other email clients

As of this time, no other email clients allow you to manage your Safe Senders and Blocked Senders lists. While you can move messages to/from the Junk folder and review the Junk folder, none of these actions will affect your Safe Senders and Blocked Senders lists.

View and release quarantined messages

Microsoft Office 365, MIT's email provider, implements numerous systems to protect users from spam and phishing attempts. Once such system is Microsoft Defender Quarantine, which catches and holds potentially dangerous or unwanted messages.

If you suspect an email you're expecting may have been quarantined you can check and if necessary, request that it be released via the Quarantine Tool

IS&T Contributions

Documentation and information provided by IS&T staff members

Last Modified:

January 29, 2024

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  1. Apr 22, 2024

    Since the quarantine process made me miss a meeting, I REALLY WANT TO OPT OUT!!!!
    I have handled my spam myself for several decades without any problem.
    Now, you want to help me??? and make me miss a meeting by not letting the message out of quarantine until the next day??? How can that be helpful?!

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