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Postfix Documentation
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Things to know

  • When Postfix searches a pcre: or regexp: lookup table, each pattern is applied to the entire input string. Depending on the application, that string is an entire client hostname, an entire client IP address, or an entire mail address. Thus, no parent domain or parent network search is done, "user@domain" mail addresses are not broken up into their user and domain constituent parts, and "user+foo" is not broken up into user and foo.

  • Regular expression tables such as pcre: or regexp: are not allowed to do $number substitution in lookup results that can be security sensitive: currently, that restriction applies to the local aliases(5) database or the virtual(8) delivery agent tables.

Postfix Documentation
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