Sendmail problem

**tcairns** · 02-13-2004

In root, when checking email in usermin I get this message:

Code:

The original message was received at Fri, 6 Feb 2004 22&#58;18&#58;55 GMT
from localhost.localdomain &#91;127.0.0.1&#93;

   ----- The following addresses had permanent fatal errors -----
<trivia@webbuild-online.com>
    &#40;reason&#58; 550-Verification failed for <root@localhost.localdomain>&#41;

   ----- Transcript of session follows -----
... while talking to webbuild-online.com.&#58;
>>> DATA
<<< 550-Verification failed for <root@localhost.localdomain>
<<< 550-unrouteable mail domain "localhost.localdomain"
<<< 550 Sender verify failed
550 5.1.1 <trivia@webbuild-online.com>... User unknown
<<< 503 valid RCPT command must precede DATA

Can anyone help me out there, I would be very happy

**tcairns** · 02-13-2004

*bump*

Forgot to say that the box is Red Hat 9!

Sorry

**Dolda2000** · 02-13-2004

Did you want to send a mail to that address to begin with?

In any case, the problem seems to be that you don't have a valid hostname configured, and thus the recieving host doesn't want to accept the mail (since it can't verify that the sending address is valid).

**tcairns** · 02-13-2004

Can you help me with this valid hostname then please

**Dolda2000** · 02-13-2004

Well, it depends very much upon your network design and a lot of other things...

How is this computer connected to the internet, and how does your network look, etc.? Do you have a registered domain name that you want to use or anything?

**tcairns** · 02-13-2004

Yes, I have a no-ip address I wish to use, this PC is connected to the net, and on the lan it is the only linux box on there, at ip 192.168.0.10

**Dolda2000** · 02-13-2004

In that case, if the system is going to act as a server for that no-ip domain name, you should set the hostname to that no-ip name. Enter it into the /etc/sysconfig/network file (like "HOSTNAME=domain.no-ip.org").

**tcairns** · 02-13-2004

Yay!

Thanks a lot Dolda2000

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