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Postfix: The Definitive Guide by Kyle D. Dent

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Name

forward_expansion_filter

Possible values:

characters

Default:

(see example)

When assigning path names to the forward_path parameter, you can use macros such as $user that are expanded by Postfix to determine the path for the current message. The forward_expansion_filter parameter specifies a list of characters that should be allowed when expanding macros. Characters that are not permitted are replaced by underscores.

Example:

forward_expansion_filter = 
 1234567890!@%-_=+:,./abcdefghijklmnopqrstuvwxyz\
 ABCDEFGHIJKLMNOPQRSTUVWXYZ

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