![]() ![]() Ī recommended default setting is provided with the threshold value of “7”, which will only filter out bulk emails that generated a high number of complaints. :light_bulb: Tip: You may want to bookmark the direct link for quick access to this page. Bulk email threshold is configured in the Anti-spam inbound policy in the Microsoft 365 Defender portal. Here, you can evaluate your organization’s security score, look at email protection reports, and set up alerts and policies for the different protection components of EOP and Microsoft Defender for Office 365. Microsoft 365 Defender ( ) is your one-stop-shop for all things security in Microsoft 365. The good news is, with filtering policies, you can apply a policy to a limited set of users, groups, or domains. This value will help you determine whether Microsoft marked the email as bulk, and whether the default bulk settings need a change. If users are either receiving bulk mail that they do not want to receive, or not receiving bulk mail that they want to receive, the first step is to look at the BCL value in the X-Microsoft-Antispam message header. Like BCL, the Spam Confidence Level (SCL) values are 0-9, with higher scores indicating the message is more likely to be spam, and there’s a special spam score (“-1”) when spam filtering is bypassed due to user or company overrides. Higher scores indicate the message is more likely to generate a higher num ber of complaints.Įvery incoming message goes through spam filtering and is assigned a spam score. The value of the BCL will be between 0 and 9. (Defender for Office 365) Email Entity pageĮvery incoming message is evaluated for a Bulk Complaint Level (BCL).(Free) Message Header Analyzer Outlook add-on.Anti-spam message headers documentation.To analyze headers, see the following resources: Message headers contain valuable information about what happens during email filtering. ![]() In this article, you’ll learn how bulk filtering works, the bulk controls in Microsoft 365 Defender Anti-spam policies, and the best practices for sending and receiving bulk messages in Office 365. This makes handling these types of messages tricky. Some recipients want it and have subscribed to it, whereas others do not, and consider it to be spam. It is often used in marketing or advertising. To learn more about what keeps your organization protected from email-based threats see Step-by-step threat protection in Microsoft Defender for Office 365.īulk or grey email typically refers to email campaigns that are sent to many recipients. This is how the entire protection stack looks:įigure 3: Multi-layered protection stack for EOP and Microsoft Defender for Office 365 While EOP offers a certain level of protection, Microsoft Defender for Office 365 complements it with an advanced set of features. Microsoft Defender for Office 365 helps organizations secure their enterprise with a comprehensive slate of capabilities across prevention, detection, investigation and hunting, response and remediation, awareness and training, and secure posture.įigure 2: Defender for Office 365 high-level features EOP is included in all Microsoft 365 organizations with Exchange Online mailboxes. Would you like us to cover more topics? Let us know in the comments.Įxchange Online Protection (EOP) is a cloud-based filtering service that helps protect your organization against spam, malware, and other email threats. This blog describes the different threat protections that Microsoft Defender for Office 365 offers and reviews how Exchange Online Protection works to protect your organization against all types of email threats, and then dives into part one, how bulk (grey) email filtering works.Ĭlick here to view additional posts in this series. Microsoft Defender for Office 365 safeguards your organization against malicious threats posed by email messages, links (URLs), and collaboration tools. We are a team of engineers with years of experience supporting Exchange and security, and we are often asked how the protections work, what protections are applied to a particular message, or how organizations should manage disagreements with the filtering verdicts. Microsoft Support is excited to start a blog series that will demyst ify how Microsoft 365 email protection works. ![]()
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