Antispam protection for your mail server is enabled by default. To turn it off, click the switch next to Enable antispam protection.
Enabling Use Exchange Server whitelists to automatically bypass antispam protection lets ESET Mail Security use specific Exchange "whitelists". When enabled, the following is taken into consideration:
•The server IP address is on the Allowed IP list of the Exchange Server
•The message recipient has the Antispam Bypass flag set on his/her mailbox
•The message recipient has the sender's address on their Safe Senders List (make sure you have configured Safe Senders List Synchronization within your Exchange Server environment including Safelist Aggregation)
If any of the above applies to an incoming message, the antispam check will be bypassed for this message, the message will not be evaluated for SPAM and will be delivered to the recipient's mailbox.
The Accept antispam bypass flag set on SMTP session is useful when you have authenticated SMTP sessions between Exchange Servers with antispam bypass setting. For example, when you have an Edge server and a Hub server, there is no need to scan the traffic between the two servers. The Accept antispam bypass flag set on SMTP session is enabled by default but only applies when the antispam bypass flag is configured for the SMTP session on your Exchange Server. If you disable Accept antispam bypass flag set on SMTP session, ESET Mail Security will scan the SMTP session for spam regardless of antispam bypass setting on your Exchange Sever.
You'll find further settings for each feature in its own section: