Configure your MTA to perform the
appropriate DNS queries for the type of Email Reputation to which
you subscribed.
- Standard: Blocks connections with a 550 level
error code (“connection refused”). The MTA returns this error code
to the server initiating the connection because the IP address is
in the Standard Reputation database as a known spammer.
- Advanced: Configure the MTA to make two DNS queries.
If the MTA does not receive a response from the first query to the
standard reputation database, it makes a second query to the dynamic
reputation database. The MTA should return a temporarily deny connection
450 level error code (“server temporarily unavailable, please retry”)
when a response is received from this database.
Legitimate email servers with compromised hosts temporarily sending
spam may be listed in the dynamic reputation database. If the connection
request is from a legitimate email server, it will re-queue and
try sending the message later. This process will cause a short delay
in mail delivery until the listing expires but will not permanently
block the email.
Some servers may have additional options for handling questionable
IP connections. These options include throttling or routing messages
for more detailed scanning.
You can find instructions for configuring the MTA or firewall
on the Trend Micro website:
These instructions have been provided by the vendor or manufacturer
of the product (MTA or firewall). Refer to your product manuals
and/or technical support organization for detailed configuration
and setup options.
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Note
Insert your Activation Code to replace the instructional text
example; do not include any dashes.
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