On Mon, Oct 25, 1999 at 08:54:50AM +0300, dd wrote:
>
> > i have just installed qmail on my linux machine. it has no running dns,
> > though but instead using an upstream dns server to resolve domain names.
> > i do not have a registered domain name for my server so my email address
> > shld be: <user>@<my ip address>.
> >
> > internal sending of mails is no problem. however, when i try to send
> > messages to remote clients and vice versa, the message could not be
> > delivered. on my remote machines, the message says "host unknown" for my
> > ip address.
>
> hi
>
> errm i had the same problem and it wasn't solved until i got my domain
> registered to the dns server. i tried sending mail to user@IP but it
> doesn't work, don't know why. afaik you'll have to wait for your domain
> name... :/ btw you _should_ be able to send mail to remote hosts.
Hi
This can�t work, because when an MTA wants to send mail to host xxx.yyy.zzz
(or ip aaa.bbb.ccc.ddd), it checks the DNS for a MX-Record for that domain -
the mx-record tells which mailserver is responsible for a certain domain -
just like A-Records say which ip-address belongs to a certain hostname.
I don�t know if it�s possible to put MX-Records for IP-Addresses in the DNS
(could be, because there _are_ reverse lookups) - but I�ve never seen
anybody do this.
Greetings, Florian Pflug
