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Postfix: The Definitive Guide by Kyle D. Dent

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Name

smtpd_expansion_filter

Possible values:

characters

Default:

(see example)

List of characters that are allowed in macro expansion by the SMTP server.

Example:

smtpd_expansion_filter = \t\40!"#$%&'(  )*+,-./0123456789:;<=>?@ \

ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~

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