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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