To prevent delays while large email files are scanned for Spam, what tool or feature will transfer email to the recipient while Anti-Spam detection takes place?

To prevent delays while large email files are scanned for Spam, what tool or feature will transfer email to the recipient while Anti-Spam detection takes place?

A.
Adaptive Continuous Download

B.
Pre-shared Secret

C.
Anti-Spam Notification

D.
Anti-Spam Architecture

E.
SmartDashboard