It was more a rhetorical question in the context of documentation
improvement. Specifically, the documentation doesn't actually say what
[blank] means. I think something like the following would be an
improvement..
Specify "all" to receive mail on all network interfaces (default),
"loopback-only" to receive mail on loopback network interfaces only
(Postfix version 2.2 and later) or leave blank to disable the reception
of email (i.e. outgoing service only).
By contrast, leaving smtp_bind_address blank does NOT disable outgoing
emails. The meaning of blank is NOT obvious to the uninitiated.
On 4/05/2023 11:10 pm, Wietse Venema via Postfix-users wrote:
Sean Gallagher via Postfix-users:
how is "inet_interfaces = all" different to "inet_interfaces = " (i.e.
blank)?
One says that Postfix will provide network service on all IP
addresses, the other does not, and all this is subject to
overrides in master.cf.
Neither constrains the SMTP client source IP address.
Wietse
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