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Spam Blocking & Filtering

Overview of Service

The first line of defense against spam is a set of remote blocking lists that are maintained by various spam-fighting organizations.

Spam that is not blocked based on its source then hits our second line of defense, the Office 365 spam filter system, which compares each email message to a long list of possible spam indicators in both the email headers and the contents. The more that match, the higher the probability it's spam.

Description & Features

  • Enhanced matching against blocking lists (between 30,000 and 250,000 blocked spam messages daily)
  • Additional, conservative blocking lists updated daily according to previous spam hauls
  • Daily updates to spam filtering settings
  • 90% success rate for filtering spam that bypasses blockers

Getting Started

Spam blocking and filtering is an automatic service. However, sometimes spam arrives untagged. To report untagged spam, forward the untagged email to

Requesting Help

If you believe you have not received an expected message due to Drexel's spam blocking, or if you are unsure whether or not a message is a phishing scam, please email IT's Help Desk at Please include the sender's email address, subject, and estimate of when the email was sent, if possible.

Additional Information

In addition to automatic spam filtering with Office 365, users can set up filtering rules to sort messages into folders or into junk. See Inbox Rules in Outlook on Microsoft's Web site for more information.