Mail Server running Postfix - Fedora Core 5 - Dyndns Godaddy

Hi !

I have a domain name registered at godaddy.com  called something.com. I have put in a mx record as mail.something.dyndns.org at godaddy Primary MX record. No secondary MX record

In my Fedora Linux using postfix I have modified the main.cf to show my hostname = mail.something.com

On my linksys router I have enabled port forwarding.  SMTP port 25 is forwarded to my linux server at 192.168.1.100 I have named my linux server hostname something.com

I am able to send external emails but not receive emails. DNS Report shows there is no listening server at mail.something.dyndns.org. When connected over the LAN I can telnet to the Linux server at port 25

What else do I need to configure.
hansel_lAsked:
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ircpamanagerConnect With a Mentor Commented:
where did you setup the MX record then?I believe at godaddy you can only setup nameservers. How often does your IP change?
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ircpamanagerCommented:
if you ping mail.something.com from outside do you get any response. if you type dig mail.something.com at bash what do you get. I am not that familiar with godaddy dns setup. I used this setup before. I purchased my domain name from godaddy, I then created an account with Zoneedit. I  had postfix as my mail server. In your MX record, is it pointing back at your IP address? What does your "mydestination=" look like in your main.cf file?
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hansel_lAuthor Commented:
Thanks for your reply. If I do a dig at the bash it shows no A record for mail.something.com The Cname record shown is mail.something.dyndns.org
my destination = $myhostname, localhost.$mydomain, localhost, something.com. From outside, If I ping mail.something.com ithe name is not resolved. I f I ping mail.something.dyndns.org it is still not resoved. If i ping something.dyndns.org I get a reply. I would have  no problem if I had a fixed IP or in control of my DNS. However, I am not sure how the MX records work using Godaddy and dyndns.
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ircpamanagerCommented:
the problem is mail.something.com doesn't exist according to root hints. I have never set up an account using dyndns so you will have to bear with me. When your on the screen where you can add MX record, what does your MX record look like on dyndns?Do you have an A record pointing to mail.something.com? You must have an A record pointing to your mail.something.com along with MX record.Post back your results.
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hansel_lAuthor Commented:
Dyndns needs a qualified domain to setup the MX record at Dyndns so I have not setup the MX record there.  I think the problem is setting up at Go dadddy. Dyndns is a dynamic IP mapping sytem. My router keeps updating dyndns about my public dynamic IP which keeps changing. So any querries about my DNS domain anmes are first routed to dyndns.org which knows my current IP at all times. I iwll try to play with the settings at godaddy.
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hansel_lAuthor Commented:
My IP changes every few hours. Go Daddy now has a "Total DNS control" service where you can set the MX record. my Mail server is listening at port 25 with the domain mail.something.com but at godaddy I cannot create an MX record with mail.something.com. I have to create it as mail.something.dyndns.org. Others have sucessfully setup with godaddy-dyndns-linux-postfix so it is something I am doing wrong.
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hansel_lAuthor Commented:
I am awarding the points to you (ircpamanager) based on effort even though I do not have a solution yet. Thanks for the help.
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ircpamanagerCommented:
thanks for the points. have a look at this http://www.google.com/support/a/bin/answer.py?answer=38449
if that doesn't give you any ideas, you could always try using the wildcard option under dyndns so all traffic for something.com gets routed to your ip address. Then just make sure port 25 is open on router and forwarding to your mail server. Not the best option but it will definitely work if you are in a pinch.
good luck
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hansel_lAuthor Commented:
The problem is solved  One needs to purchase the custom DNS solution from dyndns.org The alternative is to use the free DNS server from mydomian.com, point your domain anme to their name servers, and create an alias or Cname record for www.something .com = something.dyndns.org.  You can also use the DNS servers at zoneedit.com and some other sites. So the solution involved a combination of  Godaddy.com->mydomain.com->dyndns.org and my own email server at home with a dynamic IP. Credit to http://forums.macosxhints.com posted by bluehz
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ircpamanagerCommented:
good to know. I will archive that in case it ever comes up.
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hansel_lAuthor Commented:
Apologies. Go Daddy also has Total DNS control now, so there is no need of the additional step of registering with mydomain.com. Alternatively you can use mydomain.com and dyndns.org instead.
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ircpamanagerCommented:
thanks.
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