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Postfix: The Definitive Guide by Kyle D. Dent

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Name

empty_address_recipient

Possible values:

email address

Default:

MAILER-DAEMON

The destination address for notifications when mail with a null sender (<>) cannot be delivered. For example, when a bounce notification, which uses a null sender, cannot be delivered, it is sent to the address specified in empty_address_recipient .

Example:

empty_address_recipient = MAILER-DAEMON

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