14 and later
This feature rejects a client hostname, whose domain part resolves to a bad MX record. See
?§7.6.1 on page 291 for a full description of this feature.
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17.8 Configuration File Feature Reference | 617
17.8.8 FEATURE(bestmx_is_local)
Accept best MX record as local if in $=w V8.6 and later
The class $=w (?§22.6.16 on page 876) defines which hostnames will be treated as being
equivalent to the local hostname. That method, however, requires that the mail administrator
manually keep the class up-to-date.
As an alternative, for low- to medium-volume sites, use FEATURE(bestmx_is_local). When
enabled, this feature looks up each hostname that it finds in the bestmx internal database
map (?§23.7.3 on page 902). That map returns the best MX record (if it is known) for that
name. That returned record is then compared to the list of hostnames in class $=w to see
whether it is equivalent to the local host. If so, the address is accepted for local delivery.
The form for FEATURE(bestmx_is_local) is:
FEATURE(`bestmx_is_local??)
If you wishto limit lookups to a small list of domains, you can add them as a second
argument:
FEATURE(`bestmx_is_local??, `domain1 domain2 etc.??)
Only the hosts listed are allowed to list your site as the best MX record for use with this
feature.
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