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Postfix Documentation
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My own network addresses

The inet_interfaces parameter specifies all network interface addresses that the Postfix system should listen on; mail addressed to "user@[network address]" will be delivered locally, as if it is addressed to a domain listed in $ mydestination.

You can override the inet_interfaces setting in the Postfix file by prepending an IP address to a server name.

The default is to listen on all active interfaces. If you run mailers on virtual interfaces, you will have to specify what interfaces to listen on.

IMPORTANT: If you run MTAs on virtual interfaces you must specify explicit inet_interfaces values for the MTA that receives mail for the machine itself: this MTA should never listen on the virtual interfaces or you would have a mailer loop when a virtual MTA is down.

Example: default setting.

inet_interfaces = all

Example: host running one or more virtual mailers. For each Postfix instance, specify only one of the following.

inet_interfaces =         (virtual Postfix)
inet_interfaces = $
myhostname localhost... (non-virtual Postfix)

Note: you need to stop and start Postfix after changing this parameter.

Postfix Documentation
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