Re: DNS questions

Randy Kelsoe <rkelsoe@xxxxxxx> · Fri, 03 Jan 2003 13:26:43 -0600

Tom Diehl wrote:

On Fri, 3 Jan 2003, Randy Kelsoe wrote:

  Recipient address: me@newdomain.com
  Reason: Remote SMTP server has rejected address
  Diagnostic code: smtp;550 5.7.1 <me@newdomain.com>... Relaying denied

                                                           ^^^^^^^^^^^^^^^

                                                           ^^^^^^^^^^^^^^^

This is NOT a dns problem. You are trying to relay which is denied. You have

a misconfiguration in your sendmail configuration. 

I think this message is misleading. I am able to send mail from any of 
the clients on the private network, using my mailserver as the smtp 
server. I can send mail outbound without an error. I only get this 
"Relaying denied" on messages that are inbound. I am not a sendmail 
guru, but I am not new to sendmail, either. If you think I have a config 
problem with sendmail, can you please give me a hint as to where to look?

One suggestion since you are new at this I would suggest switching to postfix.

The reason I am suggesting this is that it's configuration files are a lot 
easier to understand. There is a version included with psyche so switching

is easy.

I did give postfix a try once, but IIRC, it does not send mail to root 
by default, and I did not take the time to figure out how to get it to 
send mail to root.

I am new to setting up DNS, so my questions are:

1. Does the ISP need to setup reverse DNS and make an address entry for 
nameserver1.newdomain.com.?

No, but you do need the reverse dns to resolve to something reasonable. 
A lot of people (including myself) reject mail that comes from an ip that

you cannot do a reverse lookup. My ip address does not reverse resolve

to rogueind.com but it does resolve and as such I can send and receive mail just

fine.

If I try to connect to openprojects.irc.net from a machine on this 
net,(using xchat) it gives me a message that my forward and reverse DNS 
entries do not match, and it does not allow me to connect.

Or, should I setup DNS locally to do this?

2. If I setup DNS locally, how can I get incoming DNS queries to use my DNS?

You can but it will not fix your problem.
Why, do you think this would help?

I don't think DNS is setup completely for this domain. I had to call the 
ISP to get them to add an MX record. With dig, I can see an entry for a 
nameserver for my domain, but if I do a dig on that nameserver, it does 
not resolve.

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