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Comment: postfix will try to convert 'localhost' to an address (because of the [])

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No Format
content_filter = smtp-amavis:[localhost127.0.0.1]:10026

In this case, amavisd-new is running on the same host as Postfix, but it can be any host. With brackets surrounding the hostname, MX lookups of the hostname are suppressed. They are also necessary when specifying bare IP addresses instead of a hostname. MX records in DNS can be used to create simple load-balancing and fallback configurations.

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