Oddball DNS issue: won't resolve hostname alone.
charlescurley at charlescurley.com
Thu Dec 20 10:29:39 MST 2007
On Mon, Dec 17, 2007 at 11:19:10PM -0700, Shane Hathaway wrote:
> Charles Curley wrote:
> > Postfix *is* supposed to relay. The postfix instance is running on
> > phoenix, and the mail is addressed to root, which phoenix has aliased
> > as ccurley at charlesc.
> Ah, ok. Some thoughts:
> - You might be able avoid the issue by changing the root alias to point
> to 'ccurley at charlesc.localdomain' instead.
> - AFAIK Postfix does not consult resolv.conf; it talks to DNS directly.
Oh. How does it find a name server to talk to without
> - See 'man 5 postconf' for reference.
> - Use 'postconf | less' to see the current config values.
> - The Postfix 'mydomain' parameter should be set to 'localdomain'.
root at phoenix:~# postconf | grep mydomain
append_dot_mydomain = no
mydomain = localdomain
> You can use the 'dnsdomainname' command to find out what the machine
> thinks its domain name is. The way to change the domain name
> persistently varies by distribution.
root at phoenix:~# dnsdomainname
root at phoenix:~#
This is on ubuntu 7.10.
I also have a name server on charlesc, Fedora Core 7, which I am
trying to phase out. When I run it, the mail system works. When I
don't, the mail system breaks.
This may be related to the fact that when I set phoenix up, charlesc
was the main DNS and everything else server.
> - Setting up MX records isn't hard and may pay off in stability.
So I need an MX record as well as an A name for each machine? Yucch.
> - If you must, you can short-circuit the whole name lookup using a
> transport map. See the 'transport_maps' Postfix parameter.
> However, while transport maps are powerful, this sort of hack
> shouldn't be necessary.
I have or have had working sendmail systems. Maybe I should just put
sendmail on all my Ubuntu machines.
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