SBS 2003 Premium - No incoming e-mail

I have had this server configured for a while and was receiving e-mail, but today I have been having many screaming people tell me that they are not getting their mail.  I have tested this and yes, I cannot send e-mail to this server.  The MX record is pointing to the correct IP and I can telnet to port 25 without a problem.  

What would you suggest I look at to find my problem?

Exchange 2003 with SP2 running IMF.

Thanks
c_ur_f8Asked:
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CetusMODConnect With a Mentor Commented:
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brakk0Commented:
Do you get any error message when you send an email to it?

Try turning off IMF and connection filtering and all the other filters. If it works, start turning it on one at a time.

Have you tried restarting the SMTP service (or rebooted the server)

Also try restarting the system attendant service
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simonpainterCommented:
Do the recipients receive email that you send via telnet?
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bilbusCommented:
goto the message tracking center, enable it. Send an email from a external source (gmail). In message center type in server name, to address, from address.

See what it says

Next goto a external email source, email a test message to gfdgfdgfdgdf@yourdomain.com

Did you get a Non Delevry report? if so is it the normal one?

Send a email to a user in your domain from an external email source, what do you get? a NDR or nothing?

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c_ur_f8Author Commented:
I only had the IMF active, I've manually restarted all the Exchange services and I've rebooted the server.

I ran a telnet e-mail test and all went just fine.

I just sent an e-mail from my Exchange server after all of this and one from Yahoo.  My mail didn't reach, but the Yahoo mail did.  I'm stumpt.
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c_ur_f8Author Commented:
It is almost acting like this Exchange server doesn't want to receive mail from other Exchange servers.  I just sent a message from another account of mine from a server at ThePlanet in Dallas and it came through ASAP.
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simonpainterCommented:
Are you using stuff like SPF checking?
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c_ur_f8Author Commented:
I thought I set this up on one server, but I cannot recall if I did it on this one.  Where can I check?
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c_ur_f8Author Commented:
My results:

"neutral"
        sending domain does not publish any sender authentication policy.
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simonpainterCommented:
so are you denying domains with no sender policy?
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c_ur_f8Author Commented:
There are no denied domains.  Besides, why would I deny myself to a domain I manage.

Also, I just set my IP as one to accept by the connection and I'm still not getting through, but another person sent me a message using an Exchange server and it came through just fine.

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c_ur_f8Author Commented:
Hey bilbus,

I missed your comment, but I sent an e-mail to gfdgfdgfdgdf@yourdomain.com and nothing happened at either end.  I can send to a real account from some domains, but not all.

There are no NDRs.
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c_ur_f8Author Commented:
If the sender is not getting a bounce back and the recipient is not receiving the message, how can I check to see who and why would either get their message through or not?
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c_ur_f8Author Commented:
I'm beginning to think this is a Microsoft update issue.  I just checked my own Exchange server and now I cannot receive e-mail from one of my personal accounts any longer.  Anyone have any thoughts about this?
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c_ur_f8Author Commented:
This question was solved through a lengthy call with Microsoft.  Our original ISP who was hosting e-mail, never updated their DNS records.  This was our big headache.
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