I basically agree with you, but here's why so you don't keep banging your
head on the wall.
On Tue, 11 Jul 2023, Ken Gillett via Postfix-users wrote:
[...] So, as I said, email to user@home works from
other hosts on the LAN, but if I try to send using (postfix)sendmail
on the Mini itself.
There has to be some way to translate "home" in your example to a
hostname; I don't think we disagree that that happens.
The traditional way to do this was the hosts file. This is consulted
before any attempt to engage in hostname lookup. Insert Active
Directory here. (I'm ignoring yp.) After all of that, maybe the DNS is
consulted. Wait, did I forget something? Oh yeah: search lists. Where do
those come in exactly?
So the point I'm making is that something is translating "home" to
service, or translating "home" to something which can be translated to a
service.
Sometimes checks for whether "home" translates to a service are done at
the application level, but oftentimes it's left to all of that
directory service machinery. Don't assume that it happens the same
everywhere, all the time.
--
Fred Morris
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