Which network service or protocol is used by sendmail for RBLs (Realtime Blackhole Lists)?

Which network service or protocol is used by sendmail for RBLs (Realtime Blackhole Lists)?

Which network service or protocol is used by sendmail for RBLs (Realtime Blackhole Lists)?

A.
RBLP

B.
SMTP

C.
FTP

D.
HTTP

E.
DNS

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nineteen + 13 =

sergiu

sergiu

E. is the correct answer

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capslock

capslock

RBLs are also called DNS-based Blackhole Lists (DNSBL)

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