17.8.14 FEATURE(delay_checks)
Check SMTP RCPT TO: first V8.10 and later
This feature is fully described in ?§7.5.6 on page 284.
17.8.15 FEATURE(dnsbl)
Reject based on various DNS blacklists V8.10 and later
The original feature was called rbl and caused hosts listed with the original ???real-time
blackhole list??? to be rejected. That feature has been deprecated and replaced by this new
FEATURE(dnsbl). With this new feature you can have hosts rejected by any number of realtime
blackhole lists, including or excluding the original. This feature is fully described in
?§7.2.1 on page 261.
17.8.16 FEATURE(domaintable)
Rewrite old domain as equivalent to new domain V8.2 and later
Some sites need to use multiple domain names when transitioning from an old domain to a
new one. FEATURE(domaintable) enables suchtransitions to operate smoothly by rewriting
the old domain to the new. To begin, create a file of the form:
old.domain new.domain
In it, the left side of each line has one of possibly many fully qualified hostnames, and the
right side has the new name. The makemap(1) program (?§10.5 on page 370) is then used to
convert that file into a database.
FEATURE(domaintable) causes a rule such as this to be included in your configuration file:
R $* < @ $+ > $* $: $1 < @ $(domaintable $2 $) > $3
Here, each host part of an address in the canonify rule set 3 is looked up in the domaintable
map.
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