Click the Connection filtering menu item.In the Exchange admin center (EAC), navigate to Protection > Connection filter, and then double-click the default policy.Create an IP Block list, and then add the IP address to the IP Block list as follows.Search for the IP address following the CIP tag in the X-Forefront-Antispam-Report header using Microsoft's message header analyzer, or manually.Obtain the headers for the message you want to block in your mail client, such as Outlook, or Outlook on the web (previously known as Outlook Web App, or OWA).Blocking email spam using spam filter block listsīlocking IP addresses with a connection filterĬustomise your Office 365 spam filter by adding the sender IP address to the connection filter IP block list.Blocking bulk mail with transport rules.Blocking IP addresses with a connection filter.This article describes the steps required by an administrator to adjust your Office 365 anti-spam filter and help prevent spam from being delivered to user's inboxes. In this context, a false negative refers to email spam or junk messages that are getting sent to a user inbox.
The Office 365 spam filter will become better able to block email spam and prevent false negative messages if you use the options listed here.
This helps to prevent the false negative issue, where email spam is allowed through to a user inbox.Īn administrator can use several Office 365 spam filter settings to help prevent email spam from being sent to a user inbox.
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