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Postfix: The Definitive Guide by Kyle D. Dent

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Name

allow_percent_hack

Possible values:

yes/no

Default:

yes

The percent hack is an old workaround that allowed sender-controlled routing of email messages. Nowadays, DNS and mail routing are much more reliable, but Postfix continues to support the hack. To turn off percent rewriting, set allow_percent_hack to no.

Example:

allow_percent_hack = yes

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