For a quick comparison of the analysis modes, see Analysis Modes.
Caution
You must reboot the appliance after changing to another analysis mode. If you do not reboot, mail will not be delivered to the downstream MTA after you change to Block or Monitor mode, and the SMTP or pether3 interface will not be reset properly after you change to or from Tap/Span mode.
Email Security - Server > Email Security - Server User Guide Release 11.x > Configuration > Email MTA configuration > Controlled live mode > Enabling or disabling controlled live mode