SBS/Exch 2003 cannot pop mail, cannot send mail

MS SBS 2003 (Exchange 2003)

This is very weird.  This will be quite a long description.  I have just taken over the support for this site.

I have an SBS 2003 box that handles mail:
Outgoing - direct through the server
Incoming - POPing of a third party site.

Everything was running fine until about Wed or Thurs of last week.  The server did get rebooted last week, but the client cannot confirm if the emails stopped working immed after that, or later.

These are the symptoms:

Internal email works fine.

We cannot send external email.

When I trigger the POP3 download, I get these error messages under the POP3 header in the application event log.

An error occurred during a POP3 transaction to server <mail.domain.com [address]>. The error is 10061 (No connection could be made because the target machine actively refused it.)

An error occurred during a POP3 transaction to server <mail.domain.com [address]>. The error is 10060 (A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.).

When I setup an Outlook Express account on the server, I get this message:

The connection to the server has failed. Account: account, Server: 'mail.domain.com', Protocol: POP3, Port: 110, Secure(SSL): No, Socket Error: 10061, Error Number: 0x800CCC0E

However, I can check any other email account (mine, for instance) if I set it up in OE.

I cannot telnet to my mail provider (bluehost.com) either 110 or 25 from the server

I would normally chalk it up to the email provider (bluehost, and I have sent them a ticket), but that doesn't explain why I can no longer send mail.  I have my SMTP connector configured to send out via my ISP's email server.  Another note, when I setup the 'test' OE account, I used the ISP's mail server and it worked.

I just turned on the log for SMTP, and here is what it has so far:

#Date: 2007-04-02 17:09:44
#Fields: time c-ip cs-method cs-uri-stem sc-status
17:09:44 199.185.220.249 - - 0
17:09:44 199.185.220.249 EHLO - 0
17:09:44 199.185.220.249 - - 0
17:09:44 199.185.220.249 MAIL - 0
17:09:44 199.185.220.249 - - 0
17:09:44 199.185.220.249 RCPT - 0
17:09:44 199.185.220.249 - - 0
17:09:44 199.185.220.249 DATA - 0
17:09:44 199.185.220.249 - - 0
17:09:44 199.185.220.249 - - 0
17:09:44 199.185.220.249 QUIT - 0
17:09:44 199.185.220.249 - - 0
17:12:21 204.209.205.51 - - 0
17:12:21 204.209.205.51 EHLO - 0
17:12:21 204.209.205.51 - - 0
17:12:21 204.209.205.51 MAIL - 0
17:12:21 204.209.205.51 - - 0
17:12:21 204.209.205.51 RCPT - 0
17:12:21 204.209.205.51 - - 0
17:12:21 204.209.205.51 DATA - 0
17:12:21 204.209.205.51 - - 0
17:12:49 204.209.205.51 - - 0
17:12:49 204.209.205.51 QUIT - 0
17:12:49 204.209.205.51 - - 0

I am wondering, is there just a backlog of outgoing messages?

Any insight would be apprecated.

Thanks,

TN
tnormanAsked:
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SembeeCommented:
If you cannot telnet to the ports of the ISP, then something is blocking those ports. You need to investigate what that is. Firewall, AV etc could all be the culprit.

Simon.
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tnormanAuthor Commented:
Simon...as always, thanks for your help on this.  Actually, it turned out to be a DNS issue.  My predecessor put an entry in the DNS for mail.domain.com and the third-party provider must have changed that recently.

I just deleted it, let DNS resolve mail.domain.com and incoming email is working fine.  However, outgoing is still not working, and I think I will start a new thread for that.

Thanks again,

TN
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