domain name for home/dialup machines ? was Re: [Exim] can't …

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Author: Dr Andrew C Aitchison
Date:  
To: exim-users
Old-Topics: [Exim] can't configure exim (FQDN hostname doesn't match)
Subject: domain name for home/dialup machines ? was Re: [Exim] can't configure exim (FQDN hostname doesn't match)
On Sat, 26 Oct 2002, CARLOSBLE wrote:

> Some weeks ago, i had some problems with exim and can't run
> exincomfig due to this error:
> Error: system's FQDN hostname (BLE.) doesn't match
> RFC1035 syntax; cannot configure the mail system.
>
> where BLE is my localhost.


As others have said, BLE is not a full internet hostname
(it is like giving the building name but not the street, city or country
in the postal address).

One of the reasons I resisted running an MTA on my home machine for
several years was that it isn't clear what domain name to use for
a dialup machine.
Each time I dial in I am given an IP name and address by my ISP,
but these may not be present when I start the exim daemon;
they will be reused by another user when I disconnect;
I may get a different one when I reconnect; and
username@mymachine is not the same as username@???...
or username@isp... so the ISP provided hostname is a bad choice of
domainname for my MTA.

I'd be interested in suggestions for a good way of choosing a domainname
for a dialup host.
Since I'm happy to use my ISPs mail service, I can use header rewriting to
ensure that my domainname doesn't appear in the headers (except where it
wont hurt and may be useful information, in places like msg-ids and helo
logging) but I still need a domain name for exim to run.

--
Dr. Andrew C. Aitchison        Computer Officer, DPMMS, Cambridge
A.C.Aitchison@???    http://www.dpmms.cam.ac.uk/~werdna