Your ISP (or whoever manages your domain's DNS) set's up the MX record.
It's DNS level information. The MX tells a mail server where to send mail
when an email is sent with out using a fully qualifed computer name.
i.e. rdcomputersolutions.net specifies a domain, but not a particular
computer. mail.rdcomputersolutions.net specifies an exact
machine/server/computer. DNS provides the MX record so that
[EMAIL PROTECTED] is a valid email address.
Keep in mind that an email address is officially user@computer where
computer is an exact pointer to a valid server. your MX record says
that server1.rdcomputersolutions.net is the default computer to send
mail to if a real computer name is not given. Currently, your DNS has no
record of the IP for server1.rdcomputersolutions.net. However, your DNS
does have a valid IP on record for mail.rdcomputersolutions.net which is
the normal convention for a default mail server in a given domain.
The *ISP* needs to either give server1.rdcomputersolutions.net a valid IP
or change your domain's MX record to reflect mail.rdcomputersolutions.net
which appears to point to your server. Until then, fix your loopback
issue Bill has pointed out and set your email client to use
[EMAIL PROTECTED] as a reply-to address.
To fix your loopback problem, tell postfix that it should accept mail for
rdcomputersolutions.net and mail.rdcomputersolutions.net (or
server1.rdcomputersolutions.net if you choose to keep that as your
server's name or both to be safe) So if I read Postfix's instuctions
correctly (I use qmail or sendmail myself) you need in
/etc/postfix/main.cf
myorigin = $mydomain
mydestination = $mydomain, $myhostname, localhost, localhost.localdomain
alternatively (this should all be on one line, mail program may break it up)
mydestination = rdcomputersolutions.net, mail.rdcomputersolutions.net,
server1.rdcomputersolutions.net, localhost, localhost.localdomain
The mydesitnation variable needs to contain a comma separated list of all
the computer names that this server should accept mail for. $mydomain and
$myhostname appear to be place holders for the obvious values.
To accept mail for mail.rdcomputersolutions.net, you need to add that to the
mydestination line (or change your hostname to mail.rdcomputersolutions.net)
Good luck,
Woody
rharvey wrote:
>
> so do I need to setup a mx record on my linux box or have my provider set
> this up correctly on their dns ?
> ----- Original Message -----
> From: "Bill Shirley" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Saturday, November 04, 2000 6:52 PM
> Subject: RE: [expert] pop-3
>
> > You can look your mx record by using nslookup:
> >
> > [root@elmo msg]# nslookup -type=mx rdcomputersolutions.net
> > Server: elmo.lan.shirleyfamily.net
> > Address: 192.168.4.1
> >
> > rdcomputersolutions.net preference = 10, mail exchanger =
> > server1.rdcomputersolutions.net
> > rdcomputersolutions.net nameserver = ns1.scottsboro.org
> > rdcomputersolutions.net nameserver = ns2.scottsboro.org
> > ns1.scottsboro.org internet address = 12.21.132.2
> > ns2.scottsboro.org internet address = 12.21.132.3
> >
> > [root@elmo msg]# ping server1.rdcomputersolutions.net
> > ping: unknown host server1.rdcomputersolutions.net
> >
> > [root@elmo msg]# ping rdcomputersolutions.net
> > ping: unknown host rdcomputersolutions.net
> >
> > [root@elmo msg]# ping mail.rdcomputersolutions.net
> > PING mail.rdcomputersolutions.net (12.21.134.137): 56 data bytes
> >
> > --- mail.rdcomputersolutions.net ping statistics ---
> > 8 packets transmitted, 0 packets received, 100% packet loss
> >
> > You have no IP address for your domain (rdcomputersolutions.net)
> > or the host (server1.rdcomputersolutions.net) that your MX record
> > is pointing to. My guess of mail.rdcomputersolutions.net has an
> > IP address but will not return a ping.
> >
> >
> > Here's what I got when I e-mailed you at
> > [EMAIL PROTECTED] :
> > ----------------------------------------------------------------------
> > This is the Postfix program at host server1.rdcomputersolutions.net.
> >
> > I'm sorry to have to inform you that the message returned
> > below could not be delivered to one or more destinations.
> >
> > For further assistance, please contact
> <[EMAIL PROTECTED]>
> >
> > If you do so, please include this problem report. You can
> > delete your own text from the message returned below.
> >
> > The Postfix program
> >
> > <[EMAIL PROTECTED]>: mail for
> > mail.rdcomputersolutions.net
> > loops back to myself
> > ----------------------------------------------------------------------
> > Are you running postfix? Is this your postfix reporting the error?
> >
> > Your DNS provider need to fix your zone.
> >
> > Bill
> >
> > > -----Original Message-----
> > > From: [EMAIL PROTECTED]
> > > [mailto:[EMAIL PROTECTED]]On Behalf Of rharvey
> > > Sent: Saturday, November 04, 2000 6:35 PM
> > > To: [EMAIL PROTECTED]
> > > Subject: Re: [expert] pop-3
> > >
> > >
> > > the mx record is on my providers domain
> > > how would I see the mx record there?
> > >
> > > ----- Original Message -----
> > > From: "Bill Shirley" <[EMAIL PROTECTED]>
> > > To: <[EMAIL PROTECTED]>
> > > Sent: Saturday, November 04, 2000 4:38 PM
> > > Subject: RE: [expert] pop-3
> > >
> > >
> > > > pop-3 is how you retrieve your mail from a server. "on
> > > demand" is fine
> > > > for this and isn't causing your problem. You provide so little
> > > > information about what you are trying to do, I doubt anyone will
> > > > be able to help you.
> > > >
> > > > What is the mail server named? Are you using sendmail,
> > > postfix, etc.?
> > > > What is the machine name of your mail clients (the one that
> > > worked and
> > > > the one that didn't)? Show us your DNS entries, particulary the MX
> > > > record.
> > > >
> > > > Bill
> > > >
> > > > > -----Original Message-----
> > > > > From: [EMAIL PROTECTED]
> > > > > [mailto:[EMAIL PROTECTED]]On Behalf Of rharvey
> > > > > Sent: Saturday, November 04, 2000 3:54 PM
> > > > > To: Expert
> > > > > Subject: [expert] pop-3
> > > > >
> > > > >
> > > > >
> > > > > under service control in linuxconf
> > > > > pop-3 says it it enabled on demand
> > > > > I can send an email at from mydomain.net
> > > > > but when I try to send a reply back or I try to send a
> > > new mail to my
> > > > > domain.net it says Host unknown (Name server:
> > > > > server1.rdcomputersolutions.net.: host not found)
> > > > > does on demand cause this? if not what does?
> > > > > please help.
> > > > >
> > > > > thanks
> > > > > Robert
--
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