117-202 Linux Networking Administration
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Demo Question 15.
Which network service or protocol is used by sendmail for RBLs (Realtime Blackhole Lists)?
A. RBLP
B. SMTP
C. FTP
D. HTTP
E. DNS
Display Answer
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Answer: E
Explanation: DNS is used by sendmail server for RBLs (Realtime Blackhome Lists)
See the sample line configuration
FEATURE(`dnsbl') à Checks a DNS implemented blackhole list to block email spammers
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