What spam protection is available with Office 365?
Exchange Online uses Microsoft Forefront Online Protection for Exchange and Microsoft Forefront Protection for Exchange Server to help protect incoming, outgoing, and internal messages from malicious software transferred through email.
This service uses
anti-spam technology to help achieve high accuracy rates, and multiple,
complementary antivirus engines to help detect viruses and other malicious code
spread through email.
Safe and Blocked Senders
You can manage your
safe and blocked senders from the Outlook Web App, manage your advanced Junk Mail options and view complete lists of safe and blocked senders.
Junk Mail and Spam Quarantine
By default, when Exchange Online receives messages, they are evaluated and assigned a spam confidence level (SCL) value.
· Low SCL values are delivered to your inbox.
· Borderline SCL values are placed in your Outlook Junk Mail folder, where they are automatically removed after 30 days.