Microsoft antispam software

Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy.

Administrators can manually download antimalware engine and definition signature updates. We strongly recommend that you download engine and definition updates before you put the Exchange server into production. If your organization uses a proxy server for Internet access, see the following section in this topic. You need to be assigned permissions before you can perform this procedure or procedures. To see what permissions you need, see the "Antimalware" entry in the Antispam and antimalware permissions topic.

Messages transported through the service are scanned for malware viruses and spyware. If malware is detected, the message is deleted. Notifications may also be sent to senders or admins when an infected message is deleted and not delivered. You can also choose to replace infected attachments with either default or custom messages that notify the recipients of the malware detection. In Exchange Online, EOP scans inbound and outbound messages that are routed by the service, as well as internal messages sent from a sender in your organization to a recipient in your organization.

You can configure the default policy for company-wide settings. For greater granularity, you can also create custom anti-malware policies and apply them to specified users, groups, or domains in your organization. Custom policies always take precedence over the default policy, but you can change the priority that is, the running order of your custom policies.

For more information, see Configure anti-malware policies in EOP. EOP uses proprietary anti-spam technology to help achieve high accuracy rates. EOP provides strong connection filtering and spam filtering on all inbound messages. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Any additional feedback?

For more information, see Configure outbound spam filtering in Microsoft It's possible that good messages can be identified as spam also known as false positives , or that spam can be delivered to the Inbox also known as false negatives. You can use the suggestions in the following sections to find out what happened and help prevent it from happening in the future. Always report misclassified messages to Microsoft.

For more information, see Report messages and files to Microsoft. Examine the anti-spam message headers : These values will tell you why a message was marked as spam, or why it skipped spam filtering.

For more information, see Anti-spam message headers. Point your MX record to Microsoft : In order for EOP to provide the best protection, we always recommend that you have email delivered to Microsoft first. If the MX record points to some other location for example, a third-party anti-spam solution or appliance , it's difficult for EOP to provide accurate spam filtering. In this scenario, you need to configure Enhanced Filtering for connectors also known as skip listing.

Use email authentication : If you own an email domain, you can use DNS to help insure that messages from senders in that domain are legitimate. To help prevent spam and unwanted spoofing in EOP, use all of the following email authentication methods:. For a more in-depth understanding of how Microsoft uses SPF, or for troubleshooting or non-standard deployments such as hybrid deployments, start with How Microsoft uses Sender Policy Framework SPF to prevent spoofing.

Verify your bulk email settings : The bulk complaint level BCL threshold that you configure in anti-spam policies determines whether bulk email also known as gray mail is marked as spam. Verify your organization settings : Watch out for settings that allow messages to skip spam filtering for example, if you add your own domain to the allowed domains list in anti-spam policies.

Use the available blocked sender lists : For information, see Create blocked sender lists. Unsubscribe from bulk email If the message was something that the user signed up for newsletters, product announcements, etc.

Standalone EOP: create mail flow rules in on-premises Exchange for EOP spam filtering verdicts : In hybrid environments where EOP protects on-premises Exchange mailboxes, you need to configure mail flow rules also known as transport rules in on-premises Exchange.