Dynamic DNS and domain registration

Brad Hards bhards at bigpond.net.au
Tue May 21 22:30:09 EST 2002

On Tue, 21 May 2002 21:50, Rasjid Wilcox wrote:
> I'm thinking of registering my own domain name and hosting it at home via
> my TransACT connection, but don't really want to pay the premium for a
> fixed IP address, so I'm looking at the dynamic dns options.
> Firstly, is it possible to host mail with a dynamic dns?  I've got the
> impression that mail exchangers do some reverse lookup thing.  Would the
> fact that my ip address would resolve back to 'somehost.webone.com.au' and
> not 'mail.mydomain.net' be a problem?  (Or at least, this is what I
> understand would happen.)
MX and A records can quite legitimately point to different places. The mail 
exchanger anti-spam test is just a test that other half of the exchange has 
an A record. 
All you should _need_ is an A record. Sendmail will try MX address first, and 
if no MX, then it will try the A record.  Others are probably similar.

> That being said, at least some of the dynamic dns providers that I've
> looked at provide e-mail forwarding as an option.
I've used dyndns.com in the past - seems to work fine for mail. 

I recently went through this for a new domain, but dyndns.com changed policy - 
three domains minimum. I ended up using zoneedit.com, which is free. Works 
good, and updates from e-smith were pretty easy to set up. I haven't tested 
MX, but it is an option you can configure.

http://conf.linux.org.au. 22-25Jan2003. Perth, Australia. Birds in Black.

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