Exchange 2003: No Mails in and no mails out - but internal mailing works fine


since weekend an old SBS2003 stopped delivering Mails. Nothing where done at this machine. Mailing from one Account to another within Exchange works. Those mails coming in the inbox of the recipient.
But if we send a mail to a mailadress outside Exchange it goes to sent-box. But isn´t delivered.
The queues all shows no error and 0 mails.
In event-log there are no errors.
Incoming Mails are successfully delivered to Exchange (we use an third-party-Pop2SMTP). But there the mail shows up at no place.
Like a big black (Mail-)hole...

Anybody out there still experienced with Exchange 2003 ?

Thanks for helping me !

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FOXActive Directory/Exchange EngineerCommented:
Is your DNS still providing an MX record to the outside world?

at a command prompt

nslookup -type=mx [your domain name]
should return a line similar to:
[domain name] MX preference = xx, mail exchanger = [your server]
FOXActive Directory/Exchange EngineerCommented:
Were there any configurations done to the routers in that environment over the weekend?
loosainAuthor Commented:
There were no changes at router config or environment.
MX is on domain at the webserver. Our tool catches the mails via pop3 and sends the mail via smtp to the server. Therefor no MX on the local machine is needed. The pop2smtp-Tool is on the same machine. The mails arrive at the tool and the exchange-gets the mails from the tool. the tool is getting a positiv answer from echange. But then the mails dissapeared...
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FOXActive Directory/Exchange EngineerCommented:
On the exchange server are you telling me there are no messages backed up in the queues?  Have you attempted to restart the smtp service on the exchange server?
FOXActive Directory/Exchange EngineerCommented:
Open exchange system manager and use the tracking utility and take a look and see what is happening this will tell you if the exchange server did receive the email and what it did after it received it.

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loosainAuthor Commented:
I found the problem. There was an old spam-software installed and deactivated. I was not told. This software stuck between connector and information store (or something like that). After activating it was all good and all mails came in... thanks.
FOXActive Directory/Exchange EngineerCommented:
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