I am having trouble with our Exchange server at the moment and cannot work out what is wrong. Basically I can receive internal mail on the domain between exchange users but nothing from an external address comes through at all.
I have even tried from my own external account but it doesn't come through on the exchange server. The e-mail doesn't get returned as undelivered and there is no error when doing a manual SMTP to the exchange using an external SMTP server.
Does anyone know what could be wrong?
SBS2003 SP2
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