Use the Global BATV rule to prevent bounced mail attacks and minimize backscatter
email. IMSS tags the From
address in messages sent
from domains in the Domain List. IMSS does not tag
messages from users appearing in the Exclusion List.
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Tip
Trend Micro recommends deploying IMSS facing the Internet if you want to enable
the Global BATV rule.
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When the Global BATV rule is enabled, all messages IMSS delivers to
external MTAs contain the BATV tag for bounced mail verification.
IMSS-generated
notification messages contain a BATV tag. When the notification
messages are delivered to an external MTA and cannot be delivered
by that MTA, the returned bounced message will be rejected by IMSS because
the message lacks a BATV tag.
For IMSS to
accept those notifications, include the notification sender in the
BATV Email Exclusion List.
