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Postfix: The Definitive Guide by Kyle D. Dent

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Name

undisclosed_recipients_header

Possible values:

string

Default:

(see example)

Header line to insert when no recipients are specified in any of the To: headers (e.g., To:, Resent-To:, Cc:).

Example:

undisclosed_recipients_header = To: undisclosed-recipients:;

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