Installation manual

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3.3.1 Microsoft Exchange Server
3.3.1.1 Transport Agent
In this section you can set up options for spam protection using the transport agent.
NOTE: The transport agent is not available in Microsoft Exchange Server 5.5.
When you Enable antispam protection by transport agent you choose one of the following options as an Action
to take on spam messages:
Retain the message - keep the message even if it is marked as spam
Quarantine message - send a message marked as spam to the quarantine mailbox
Delete message – delete a message marked as spam
If you want to include information about message’s spam score in its header, enable the Write spam score to the
header of scanned messages option.
Function 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:
Sending sever IP address is on the Allow IP list of Exchange server
Message recipient has Antispam Bypass flag set on his/hers mailbox
Message recipient has sender's address on 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 omitted for this message, thus 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 for antispam scanning of the traffic between these two servers. The Accept antispam
bypass flag set on SMTP session is enabled by default and it applies when there is antispam bypass flag configured
for the SMTP session on the Exchange server. If you disable Accept antispam bypass flag set on SMTP session by
clearing the checkbox, ESET Mail Security will be scanning the SMTP session for spam disregarding Exchange sever
antispam bypass setting.
The Enable Greylisting function activates a feature that protects users from spam using the following technique:
The transport agent will send a “temporarily reject” SMTP return value (default is 451/4.7.1) for any received email