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Need help with SMTP

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WalleyeGuy

Technical User
Oct 18, 2007
44
US
OK, here's my issue in very very plain terms.
I'm being told that SMTP is not working on our server (Win2K3 Server w/Exchange 2003 Ent.).

That's all I'm being told, due to a single person forwarding on a returned email to my upper management.

Here is the message they received

Hi. This is the qmail-send program at yahoo.com.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<user@company.com>:
###.###.##.## failed after I sent the message.
Remote host said: 553 Connection rejected due to installation settings of receiving SMTP host

That is all I have to work with. I see no errors on the server, most users get Email correctly. I do know that the email was sent from a btinternet.com Email account to the company Email.

Since they see that message they are thinking other issues are tied to it as well (which I guess I can see that). My direct manager set up an account at mxsave.com, to which basically seems like an SMTP Relay and holds our Email if our server goes down for one reason or another - That system has quite a bit of Email that is not being sent to us for some reason.

History
Company hired me to bring their Email system up to date. Well, I had never worked with Exchange before and have never been an Email Admin of any flavor before, to which was told to everyone. The company was on an Exchange 5.5 system to which the database was dangerously close to the database limit. They are currently all on an NT Domain

Current Network Setup (this is where I cringe)
The company is about 700 ppl in size within the US and UK
All Servers are in the US, all communication goes over a couple of T3 lines. The internal network is or is not (however, you want to look at it) public address scheme. They use the public address range owned by a different company; however, NAT the ip for inbound/outbound traffic.

I've done the following:
Built a Win2K3 Server Active Directory
Created a two way trust between NT and AD
Migrated all accounts and types except computers
Built a new Exchange 2003 System on Windows Server 2003 as a member server
All Exchange Migration seems to have been successful (with a few minor (in my mind) hiccups)

Is there anyone that can help tell me where to start troubleshooting and maybe what to look for. When I don't have any real errors to hunt down, I have no clue what to look for.

Thanks
 
From what I'm being told, we have no such setting on our firewall.

 
Not sure if this will help at all.
External DNS Servers are not ours, they use the ISP's

They have the MX record set to mail.company.com
 
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