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Exchange 2007 on SBS 2008 - Cannot receive mail from outside

We have Exchange 2007 installed on Windows Server 2008 SBS. Everything was running fine until about 5 day's ago.
- We can access OWA from inside and outside the building fine
- We can send/receive E-mails from inside the local network
- We can send E-mails to outside E-mail addresses
- We cannot receive E-mails from outside the building
- We can telnet port 25 and 443 from outside the building

Also, it started working again yesterday about 10:30 AM then noticed it wasn't working at about 7:45 AM this morning.  Any suggestions? We think it may have something to do with windows updates.
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considerscs
Asked:
considerscs
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1 Solution
 
Wonko_the_SaneCommented:
ANy errors in the event logs?

Try sending a test mail using telnet (from the outside). If you don't know how to do that, those instructions should help:
http://support.microsoft.com/kb/153119

What is the result?
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considerscsAuthor Commented:
Getting a lot of Windows SharePoint Services 3 Search errors in event log. I will try to send E-mail through telnet and post result.
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considerscsAuthor Commented:
Every time I try the MAIL FROM: command I get Insufficient system resources or invalid address response.
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Wonko_the_SaneCommented:
http://technet.microsoft.com/en-us/library/bb201658.aspx

Check for errors from MSExchangeTransport
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considerscsAuthor Commented:
Ran this through E-mail test online and here are the results:
Pasting often results in a syntax error.
This is evidenced by an @ (and nothing else ) in the transaction record.
The test process should not cause any problems to the mail host.
If this proves not to be the case, please leave a comment to the sysop.
There is a 10 use per day limit on the email address tester.
You have used this utility 0 times today.
The query string is O.K.
support@eghc.org passes the syntax check. TLD is valid.
The domain is eghc.org
The mail host for eghc.org is mail.eghc.org.
Looking up IP address for mail.eghc.org.
The IP address for mail.eghc.org. is 12.158.100.197
12.158.100.197 is not black listed.
creating socket.....OK.
Attempting to connect to '12.158.100.197' on port '25'...
Connected

response: 220 EGHC-SRV-1-06.eghc.internal Microsoft ESMTP MAIL Service ready at Thu, 24 Feb 2011 10:49:35 -0500

sending: HELO
response: 250 EGHC-SRV-1-06.eghc.internal Hello [208.65.90.64]

sending: MAIL FROM tester@69.59.103.127
response: 501 5.1.7 Invalid address

Your server may not configured to accept "domain literals".
Refusal of "domain literals" like tester@69.59.103.127 is a violation of RFC-822 Section 6.2.3

sending: MAIL FROM: postmaster@mail.eghc.org
response: 250 2.1.0 Sender OK

sending: RCPT TO support@eghc.org
response: 250 2.1.5 Recipient OK

sending: QUIT
Closing socket...socket closed
Need help with the server return-codes? Click here.
This page last modified: August 08 2010
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Wonko_the_SaneCommented:
This looks even more like a backpressure problem now, that's why it works sometimes. Please read the article I posted, and search for MSExchangeTransport events, it should give you a clue.

Backpressure is a feature that prevents Exchange from getting overloaded by rejecting new e-mails when certain conditions have been reached, such as low disk space, low memory, etc. The trick is to identify the problem and either fix it or to adjust the backpressure parameters.
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considerscsAuthor Commented:
Getting bounce backs with this error now:
Delivery is delayed to these recipients or groups
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Wonko_the_SaneCommented:
Any input on the backpressure? Did you find corresponding events?

The delay notifications may be generated by the sending servers since they will queue the mails and keep trying.
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considerscsAuthor Commented:
I do not see any backpressure related errors in the event logs. I am still looking into the rest.
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considerscsAuthor Commented:
Deleted logs to free up space on C: drive and now everything is flowing good. Thanks.
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