To use NRS:
Choose IP Filtering > NRS from the menu.
Select the Enable check box.
Click a radio button next to one of the following:
Default intelligent action—NRS permanently denies connection (550) for RBL+ matches and temporarily denies connection (450) for Zombie matches.
Take customized action for all matches
SMTP error code—Rejects any connections that have a certain SMTP code. Type an SMTP code.
SMTP error string—Type the error string associated with the SMTP error code.
Click Save.
See also: