FEATURE(rbl)
Reject connections based on rbl.maps.vix.com V8.9 through V8.11
FEATURE(rbl) was
introduced in V8.10 as an aid to blocking spam
email. But because it directly looked up hosts at
rbl.maps.vix.com, it was soon
rendered obsolete. V8.11
sendmail replaced FEATURE(rbl) with
FEATURE(dnsbl)
(FEATURE(dnsbl) on page 261), which allows you to specify the
host to use for lookups. V8.12
sendmail extended that
ability further with FEATURE(enhdnsbl) (FEATURE(enhdnsbl) on page 263), which also allows you to customize
error messages and determine what to do with
temporary failures.
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