[juneau-lug] Re: Mail Exchangers

  • From: "Kevin Miller" <Kevin_Miller@xxxxxxxxxxxxxxx>
  • To: <juneau-lug@xxxxxxxxxxxxx>
  • Date: Fri, 31 Mar 2006 13:43:39 -0900

mike noel wrote:
> I'd be willing to try it. I'm using sendmail 8.12.8 on an RH9 server.
> Do=20
> you have some idea how to set up our two servers to do this?

It's not hard.  In sendmail I think the default retention time is 4 or 5
days.  Usually plenty of time for service to be restored.  After that it
will return messages to the sender.  The files you want to edit are
relay-domains and mailertable, probably in /etc/mail.

In mailertable you put in the domains you're accepting for and where to
route the mail when the primary server becomes available.  For instance
you might have an entry like this:

mikenoel.org         esmtp:[192.168.5.17]

The domain and address are purely fictictious of course.  One would put
in the IP of the mail server that should be accepting for that domain if
it wasn't down for some reason, thus wouldn't use a non-routable
address.  Separate the fields with TABS, not spaces.

After you've created/edited your mailertable you need to turn it into a
db with the following command:

  makemap hash /etc/mail/mailertable < /etc/mail/mailertable

(Don't be thrown by the input and output files having the same name.
makemap will append an extension automatically so the output file ends
up being mailertable.db.)

In relay-domains you just put in the name of the domains for which
you'll relay:

  mikenoel.org
  kevinmiller.org
  someotherdomin.org

I think that'll about do it...

...Kevin
--=20
Kevin Miller                Registered Linux User No: 307357
CBJ MIS Dept.               Network Systems Admin., Mail Admin.
155 South Seward Street     ph: (907) 586-0242
Juneau, Alaska 99801        fax: (907 586-4500
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