Please help with sendmail problem

[agabriel at coe.neu.edu (Anthony J. Gabrielson)]

sendmail.cw is just a list of hosts that you will except email as.  Just
put together a list in there and away it goes.

Anthony

On Wed, 12 Dec 2001, Bill Horne wrote:

> "Jerry Feldman" <gaf at blu.org> wrote:
>
> >You've got one problem here because union.ne.mediaone.net is a valid
> >mediaone host name. I strongly suggest that you name the hosts on your
> >internal net with a different domain, such as horne.net or something.
> >Your sendmail.cw file is used for host forwarding.
>
> Is that the sendmail.cf file, or a different one? Sorry if this is
> obvious, but sendmail's not my area of expertise.
>                       ^
>
> >Checkout  http://www.sendmail.org/ for tips and faqs.
>
> Will do. (But see below)
>
> >Bill Horne wrote:
> >> Thanks for reading this: I'm having a problem with sendmail and need help.
> >>
> >> I've got an entry in my /etc/hosts file for a machine on my home network, e.g
> >> .,
> >>
> >> 10.50.50.72   union.ne.mediaone.net
> >>
> >> Also, in the /etc/hosts.conf file, the entry is "order hosts,bind".
> >>
> >> However, sendmail, when trying to deliver mail to a user on union.ne.mediaone
> >> .net, is doing a dns lookup *before* checking the hosts file, and is obtaining
> >> an incorrect address that has not yet aged off mediaone's nameservers.
> >>
> >> How do I force sendmail to check the /etc/hosts file first?
> >>
> >> TIA.
> >>
> >> Bill Horne
>
> I should apologize for not giving more details: the objective here is to
> set up a hot-swappable machine, which can be plugged into the cable
> modem and assume its duties without reconfiguration. To that end, it has
> been set up with DHCP so that it'll work with the cable modem if I need
> to connect it directly, and when the Linux box is in between it and the
> modem, Linux uses a "fixed-address" DHCP parameter to lock the "union"
> machine to a known IP on my detached network. The "union" box has
> software on it which requires a domain name and can't get it from DHCP,
> so using a "phantom" domain isn't my first choice.
>
> For that reason, I'd like to keep the "union.ne.mediaone.net" domain
> name in the box if possible: I'd like the Linux router/firewall to use
> the detached address when it's on line, but to have the "union" machine
> revert to "dumb wintel" mode if I need to plug it into the modem
> directly.
>
> We all know crashes happen at the worst times: for me, they're always
> when I don't have two brain cells to rub together and my wife is in need
> of the net. Ergo, I want hot swap capability, where moving a patch cable
> and a reboot is all that's needed to get the machine going.
>
> If sendmail is hard-coded to do a DNS lookup, I'll use a different MTA,
> but I want to solve this problem instead of going through another MTA's
> learning curve. So, to restate: how do I force sendmail to check (and
> believe) the "hosts" file instead of doing a DNS lookup?
>
> Bill
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