Name
disable_dns_lookups
Possible values:
yes/no
Default:
no
Normally when Postfix determines where to deliver a message,
it first looks up the DNS MX records for the destination domain. If
disable_dns_lookups is set, Postfix does not check for MX records and
delivers directly to the A record it finds for the destination
domain.
Example:
disable_dns_lookups = no
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