![]() ![]() We also determined that the allowed sender and allowed domain lists in anti-spam policies and Safe Senders in Outlook were too broad and were causing more harm than good. Our data also indicates that the false positive rate (good messages marked as bad) for high confidence phishing messages is very low, and admins can resolve any false positives with admin submissions. ![]() Our data indicates that a user is 30 times more likely to click a malicious link in messages in the Junk Email folder versus Quarantine. This is the same approach that we've always used on malware, and now we're extending this same behavior to high confidence phishing messages. The spirit of being secure by default is: we're taking the same action on the message that you would take if you knew the message malicious, even when a configured exception would otherwise allow the message to be delivered. For more information, see Manage quarantined messages and files as an admin in EOP. By default, only admins can manage messages that are quarantined as malware or high confidence phishing, and they can also report false positives to Microsoft from there. Malware and high confidence phishing messages should be quarantined. Secure by default isn't a setting that can be turned on or off, but is the way our filtering works out of the box to keep potentially dangerous or unwanted messages out of your mailboxes. The Redirect message to email address action for high confidence phishing messages is unaffected. Anti-spam policies that use this action for high confidence phishing messages will be converted to Quarantine message. We have deprecated the Move message to Junk Email folder action for a High confidence phishing email verdict in EOP anti-spam policies. More information on these overrides can be found in Create safe sender lists. If you want to temporarily allow certain messages that are still being blocked by Microsoft, do so using admin submissions. Exchange mail flow rules (also known as transport rules).Allowed sender lists or allowed domain lists (anti-spam policies).See Configure anti-spam policies in EOP.įor more information about EOP, see Exchange Online Protection overview.īecause Microsoft wants to keep our customers secure by default, some tenants overrides aren't applied for malware or high confidence phishing. Email identified as high confidence phishing will be handled according to the anti-spam policy action.For more information, see Configure anti-malware policies in EOP. Whether recipients are notified about quarantined malware messages is controlled by the quarantine policy and the settings in the anti-malware policy. Email with suspected malware will automatically be quarantined.Microsoft 365 organizations with mailboxes in Exchange Online are protected by Exchange Online Protection (EOP). Legacy settings: Some configurations for older products and features might need to be maintained for business reasons, even if new, modern settings are improved.Risk: Security might block important activities.Usability: Settings shouldn't get in the way of user productivity.However, security needs to be balanced with productivity. "Secure by default" is a term used to define the default settings that are most secure as possible. Learn about who can sign up and trial terms here. Did you know you can try the features in Microsoft 365 Defender for Office 365 Plan 2 for free? Use the 90-day Defender for Office 365 trial at the Microsoft 365 Defender portal trials hub. ![]()
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