Re: [SLUG] What's so great about qmail?

[Jason Nicholls <jason@nospam.mindsocket.com.au>]

G'day,

On Sun, Jul 02, 2000 at 12:30:17PM +1000, David Fisher wrote:
> > On Sun, Jul 02, 2000 at 10:45:15AM +1000, David Fisher wrote:
> > > That made precisely no difference whatsoever.  I still get the same
> > > messages from EXMH and fetchmail.  Any further suggestions, folks?
> > 
> > Well, are you sure that you've tweaked the right hosts.allow
> > file, corresponding to the tcp-env/inetd that you're using.  In
> > my experience, there is wide variation in the specifics of these
> > things.
> 
> Well, I'm totally confused now.  How many hosts.allow files are there?  I
> made the changes you suggested in /etc/hosts.allow - it's the only one I
> know.  

How did you go about the install, some binary package or from source?

It might be an idea to understand the flow of mail once it's received:

1: An email is received and tcp_wrappers is initiated via inetd:

  Make sure the /etc/hosts.allow file is configured
  correctly (as shown before by David)

  This will tell qmail to allow relaying or not.

2: Qmail starts to handle the mail:

  It will check /var/qmail/rcpthosts (if you're not allowed to relay) to see
  whether it should allow delivery of the mail.

  It will check /var/qmail/locals to see whether to deliver local or remote.


NOTE: qmail may not be configured as above - sometimes it may not use
tcp_wrappers (tcpd). Take a look in /etc/inetd.conf for the
following lines:

tcp_wrappers (tcpd):

smtp stream tcp nowait qmaild /usr/sbin/tcpd /var/qmail/bin/tcp-env \
	/var/qmail/bin/qmail-smtpd

*not* tcp_wrappers (tcp-env):

smtp stream tcp nowait qmaild /var/qmail/bin/tcp-env tcp-env \
	/var/qmail/bin/qmail-smtpd


IF you're using straight tcp-env then the situation is similar to tcp_wrappers
(shown above) however step 1 is skipped. ie: You jump straight to step 2 and
assume relay is denied (so it checks /var/qmail/rcpthosts). This is a very
restrictive setup - really only to allow delivery of local mail...

I also suggest reading the doco that comes with the qmail distribution (all
the INSTALL* files and the FAQ).

Hope this helps ;)

Jason Nicholls
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Jason Nicholls    icq: 11745841    email: <jason@nospam.mindsocket.com.au>
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