34
Lotus Domino 6 spam Survival Guide for IBM eServer
Figure 4-1
DNS Blacklist filters settings (Enabled)
6. Make the desired changes and click Save & Close.
DNS Blacklist filters are disabled by default. Figure 4-1 on page 34 depicts the
field as it exists when it is Enabled. The additional 3 options will only be available
when the feature is enabled.
The “DNS blacklist sites” field is used to specify the DNSBL site (or sites) that
Domino will query. When you select sites to query, be aware that many DNSBL
sites are fee-based and may require a subscription prior to utilizing their server.
Contact the DNSBL site for more details.
When enabled, Domino will query the DNSBL sites that you’ve specified to
determine if the connecting host name is listed in the database as a blacklisted
site. If the host is not found in the first DNSBL site, Domino will then look to all
subsequent DNSBL listed (if applicable). This feature is not enabled by default,
but it is extremely useful in environments that have Domino as their SMTP server
connected directly to the Internet.
This option will provide a level of checking for your inbound SMTP mail, as well
as statistical reporting about where each of the blacklisted sites was found. Using
the statistics available though Domino, you might want to make a business
decision to implement tighter server mail rules, based on the sites found in the
DNSBL.
Note:
You should consider creating a descriptive SMTP error message for
rejected messages. Explain why you are not accepting this message and that
if the message is
not
spam, suggest that the sender’s organization contact
organizations maintaining DNS blacklist sites to get off their blacklists. You
might also consider listing the DNS blacklist sites your organization uses for
checking connecting hosts for inbound SMTP mail.
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