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First time install of SBS 2003 - can't receive smtp e-mail

Posted on 2004-09-20
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Last Modified: 2007-11-27
Just installed SBS 2000 standard.

I can get on the internet and send smtp mail. Cannot receive mail. Think I have set up MX record to point to my routers public IP but unsure what to do next. Ran the Internet and Mail wizard in SBS 2003 and sure I answered all correct - still no joy.

Ping my public ip from internet works fine
Telnet to the server port 25 from inside ADSL router seems to work fine
telnet to public ip port 25 from internet fails
telnet to mx record web server port 25 also fails
 all this and I have fixed ip on private net and routed port 25 to internal server

any clues? or am I just to stupid to own a mail server!!
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Question by:testpartners
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Expert Comment

by:rhandels
ID: 12106967
Hi,

You should be able to telnet to your external ip addresses on port 25 (the ip address that the MX record is pointing to. Also, try to do a nslookup to see if your domain and MX record is allready changed (or try searching www.dnsreport.com). If the MX record points to your external ip address, then make sure that traffic is allowed to this port by your router and your provider, then mail should be comming in...
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Author Comment

by:testpartners
ID: 12107036
Tried telnet to ip address on port 25 (ip in mx record) got error message connection to host lost?
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Author Comment

by:testpartners
ID: 12107048
sorry forgot to mention that dnsreport says everything is ok subject to a couple of warnings that seem to be ok in principle EXCEPT when it tried to connect to mail server this fails everytime
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Author Comment

by:testpartners
ID: 12107052
as thsi is a test system the domain in question is tp2.co.uk.
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Expert Comment

by:rhandels
ID: 12107079
If you're absolutely sure that MX records are correct and you cannot telnet into port 25, i would check your routers security config, there might be a problem inthere. Or maybe your provider doesn't support incoming traffic on port 25
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Author Comment

by:testpartners
ID: 12107182
No I'm not sure! I know the IP address is right but the mail server name I am definately unsure of. I am not sure how to get the server domain and mail server names right
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Expert Comment

by:rhandels
ID: 12109585
Hi,

The MX records should be set by your provider. Just call your provider and ask it to chnage the MX record for your mail.domainname.com record so mail will be delivered to your external ip address.

Also, make sure that your router let's traffic through on port 25 and translates it (NAT) to the internal ip address of your router...
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Author Comment

by:testpartners
ID: 12109970
Ours provider doesn't offer that so I moved it to Zoneedit
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Expert Comment

by:rhandels
ID: 12110027
Hi,

The provider that hosts your domain is the "boss" of the domain, so they should enable this. They are absolutely capable o doing this. Maybe they don't want to do it, but then you're with the wrong ISP.... So i should go to the ISP or website provider and make sure the MX record is created..
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Author Comment

by:testpartners
ID: 12116044
I know that would be a nice position to be in but they recommended zoneedit so thats what I did! As far as the mx record goes how do i derive the mail server domain.  My server is tpl1 the domain I registered and that holds the mx record is tp2.co.uk  when i ping the server from inside the network on port 25 it responds with the domain tp2?
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rhandels earned 500 total points
ID: 12117289
Hi,

Here is how mail should be traveling. Your MX record is only used for delivering mail of a specified domain (tp2.co.uk in your case). The only thing a MX records does is translate the ip address where mail should be delivered to a user friendly name  (like mail.tp2.co.uk). After that, if mail is send to your domain, the MX record will make sure that mail addressed to @tp2.co.uk is send to your external ip address (let's 100.100.100.100). Your router or firewall that holds this ip address should be configured so that port 25 is listening for incoming request (just don't block port 25) and, mail needs to be send to an internal mailserver (assuming the mailserver doesn't have it's own external ip address).

So if mail is being delivered, first step to do is to check if port 25 is listening on ip address 100.100.100.100. To check this, go to your home pc (or any pc that is not on the internal network) and try to telnet into port 25 of ip address 100.100.100.100

telnet 100.100.100.100 25

If this opens a box stating that port 25 is waiting for incoming request, then your router/firewall is setup correctly. If this doesn't work, make sure to set up your firewall/router correctly.

I fthis works, there can only be a problem with your MX record (assuming your ISP doesn't block port 25, which i guess they don;t block, because they send you to zoneedit). You can check your MX record at www.dnsreport.com. I'm assuming this works, because you siad your MX records were ok. If so, make sure your router is configured correctly (or your firewall). If you don't know how to do this, please post which firewall/router you use, maybe i can help. Else, try to ask a new question about how to set this up..
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Author Comment

by:testpartners
ID: 12117743
Hi again,

I have telnet on a machine not on that network but inside the router and it works fine. A telnet from a PC on a seperate internet connection wits a while and then gives me a message host not found. I can ping my public IP address and both the root domain tp2.co.uk and the supposedly correct mail server domain of tpl1.tp2.co.uk.

I have a Vigor 2600v and have put the server on a fixed internal IP.

I have tried opening port 25 and the routers port redirection table shows all port 25 traffic should be routed to the servers ip - still no luck from internet side of the the router

I have put the server IP in on the Vigor's DMZ  and still no luck - it all points to my router at least thats how it seems to me.

If I understand your last response right it doesn't really matter what the mx record says as long as it points to the IP address of my router?

How do I determine what the server thinks is the domain name of my SBS exchange server?

Thanks for your patience and perseverance!!
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Author Comment

by:testpartners
ID: 12117791
When I telnet into the server from inside the router I get the following response
220 tp2.co.uk Microsoft ESMTP MAIL Service, Version: 6.0.3790.0 ready at Tue, 21 Sep 2004 23:44:35 +0100

Does this not suggest it is working at this point?
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Author Comment

by:testpartners
ID: 12118477
Well after all this s*** I borrowed another router and it worked first time. Thank you for all your help.

As its my first time here I don't really u nderstand this points system could and this is my last question explain what  I do next.
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LVL 23

Expert Comment

by:rhandels
ID: 12120125
Hi,

Glad to see the problem is fixed.... So the problem was a faulty router?? Then we were on the right track indeed...

Regarding points. You allready accepted my answer so that's one of the options you have. The other one is to split points between different experts that helped you. The third option is to ask for a refund if you think an experts doesn't deserve the points..

Here's also a link on how to close a question (you allready closed the question... just for future  reference..)

http://www.experts-exchange.com/Community_Support/New_to_EE/help.jsp#hs7
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