I updated the inet_interfaces documentation anmd clarified its
relationship with smtp_bind*_address and system-chosen source IP
addresses.
Wietse
When smtp_bind_address and/or smtp_bind_address6 are not specified, the
inet_interfaces setting may constrain the source IP address for out-
bound connections over IPv4 and/or IPv6. Support for IPv6 is available
in Postfix version 2.2 and later.
o When inet_interfaces specifies one IPv4 address, and that is not
a loopback address, the Postfix SMTP client uses that as the
source address for outbound IPv4 connections.
o Otherwise, the Postfix SMTP client does not constrain the source
IPv4 address, and connects using a system-chosen source IPv4
address. This includes the cases where inet_interfaces specifies
all, or no IPv4 address, or one IPv4 address that is a loopback
address, or multiple IPv4 addresses.
o The same reasoning as above applies to IPv6.
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