The Microsoft service analyzes every incoming email based on various attributes and details, including the reputation of the sender, the email content, presence of malware, phishing likelihood, and more to assign a score that indicates the likelihood that this email is spam or malware. Any email with malware or is part of a phishing campaign is auto-deleted. All other emails are assigned a score based on the likelihood that the email is spam. DePaul administrators periodically review and adjust the filter settings to best manage the balance between which emails get delivered (even junk email) vs. which are discarded.