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Date: Mon, 16 Apr 2012 02:39:44 +1000 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: Robert Bonomi <bonomi@mail.r-bonomi.com>
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Cc: Ron <rg.lists@rzweb.com>, freebsd-questions@freebsd.org
Subject: Re: Postfix + Courier IMAP local email problems
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In freebsd-questions Digest, Vol 410, Issue 12, Message: 2
On Sat, 14 Apr 2012 10:51:36 -0500 (CDT)
Robert Bonomi <bonomi@mail.r-bonomi.com> wrote:
 | Ron <rg.lists@rzweb.com> wrote:
 > > OK, I found the problem.  It was the hostname not being set correctly.  
 > > What threw me was that it was correct in the rc.conf file, but I did not 
 > > know you needed to reboot the machine to have it take effect.  It just 
 > > never occurred to me to run 'hostname' and see since I was seeing it 
 > > correctly in the rc.conf.
 > 
 > FYI, while it's true tht rc.conf is processed only t boot time, you don't
 > _have_ to reboot when you make a change.  What you _do_ need to do is run
 > the same commands the the rc processing does.  Unfortunately, with the 
 > 'rc.d'-style process, where rc.conf just sets environment variables, and
 > everything else happens 'by magic', it can be a major effort to figure 
 > out -what- commands need to be run when you change something, and 'reboot'
 > *is* the simplest way to get the  job done.  One reason _I_ much prefer
 > the "old" BSD-style '/etc/rc.boot' and '/etc/rc.local' approch.  It was
 > =far= simpler to see exactly what was going on, in what order, and with
 > what params.  Tracking stuff through the rc.d/* swamp is a 'project' -- 
 > there is a whole nuther 'command language' to master.  :((

It's really not all that complicated to change hostname(1)

t23# grep hostname /etc/rc.conf
hostname="t23.smithi.id.au"
t23# hostname
t23.smithi.id.au
t23# hostname boofar
t23# hostname
boofar
t23# csh
boofar# exit
exit
t23# hostname
boofar
t23# hostname t23.smithi.id.au
t23# hostname
t23.smithi.id.au

cheers, Ian