Microsoft Defender for Office 365 supports outbound spam policies that control sending limits and automatically restrict accounts exhibiting suspicious outbound email activity.
Option A is correct because a custom outbound anti-spam policy can target Group1 specifically, allowing administrators to enforce more restrictive sending limits for marketing department mailboxes without changing the organization-wide configuration.
Administrators can navigate to Microsoft Defender portal → Email & collaboration → Policies & rules → Threat policies → Anti-spam, and create a custom outbound policy.
The policy should include Group1, configure the appropriate external recipient limit, and select Restrict the user from sending mail as the action when a limit is reached.
Option B is incorrect because modifying the default outbound policy would affect other users not covered by a higher-priority custom outbound policy.
Option C is incorrect because Strict preset security policies do not contain configurable outbound spam policies.
Option D is incorrect because Standard preset protection cannot provide a custom outbound sending limit.
Option E is incorrect because inbound anti-spam policies protect incoming email rather than restricting compromised users ' outgoing messages.
Crucially, Microsoft ' s documentation confirms that Strict and Standard preset security policies do not override outbound spam policies. Therefore, the custom outbound policy can apply to Group1 without excluding its members from Strict protection.
Microsoft References:
