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Postfix: The Definitive Guide by Kyle D. Dent

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Name

smtp_bind_address

Possible values:

IP address

Default:

(null)

IP address of the interface the SMTP client should bind to when making connections to mail servers. Setting this parameter is necessary only on multihomed systems where you explicitly must use just one of the interfaces.

Example:

smtp_bind_address = 192.168.15.23

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