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Postfix: The Definitive Guide by Kyle D. Dent

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Name

strict_7bit_headers

Possible values:

yes/no

Default:

no

Specifies whether or not Postfix should accept only 7-bit text in message headers as required by the RFC. By default, if mail arrives with 8-bit text in the message headers it is rejected.

Example:

strict_7bit_headers = no

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