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Postfix: The Definitive Guide by Kyle D. Dent

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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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