Lack of emails received after installilng Email Server Editi

[pcostanza]

My SBS 2003 server was dying and I purchased a new one with SBS 2008. I used my licensed AVG9 and Email Server Edition as I had in the past but immediately I've noticed a huge reduction in emails received. We have Postini installed to catch the junk but even then I was getting about 80 emails a day and now I'm down to 3 or 4 each day. I asked a few business customers to send me email to see if I get them and I do get most, but not all. It's not Postini as we have already taken that out of the equation until we get this fixed.
Is it possible is the Anti-Spam that's stopping emails from coming in? We've not done anything different than with the old server so I'm not sure what is causing this problem. But, as a small business, I live and die by email and that's a huge form of communication for my customers.
Any ideas or suggestions would be appreciated.

Paul

[sc123]

You could always install AVG without the Anti-Spam component, but I'd say it's probably not AVG because it's not that aggressive by default.

[pcostanza]

Here are some of the errors I'm seeing when I can't get any emails:

MSExchangeTransport 1033 7/26/2010 2:09:57 AM 1,338
Event Details: An exception was thrown while processing data from client IP address 114.45.54.71. The exception is System.NullReferenceException: Object reference not set to an instance of an object. at AvgAntispam4Exchange2007.AvgAspamSmtpReceiveAgent.AvgAspamEndOfDataEventHandler(ReceiveMessageEventSource source, EndOfDataEventArgs args) at Microsoft.Exchange.Data.Transport.Smtp.SmtpReceiveAgent.Invoke(String eventTopic, Object source, Object e) at Microsoft.Exchange.Data.Transport.Internal.MExRuntime.Dispatcher.Invoke(MExSession session) at Microsoft.Exchange.Data.Transport.Internal.MExRuntime.MExSession.AsyncInvoke(Object state) at Microsoft.Exchange.Data.Transport.Internal.MExRuntime.MExSession.BeginInvoke(String topic, Object source, Object e, AsyncCallback callback, Object callbackState) at Microsoft.Exchange.Protocols.Smtp.MExEvents.RaiseEvent(MExSession mexSession, String eventTopic, Int32 timeout, AsyncCallback callback, Object state, Object[] contexts) at Microsoft.Exchange.Protocols.Smtp.BaseDataSmtpCommand.RaiseEODEvent(Object state) at Microsoft.Exchange.Protocols.Smtp.BaseDataSmtpCommand.OnEod(Boolean isAsync) at Microsoft.Exchange.Protocols.Smtp.BaseDataSmtpCommand.RawDataReceived(Byte[] data, Int32 offset, Int32 numBytes) at Microsoft.Exchange.Protocols.Smtp.SmtpInSession.ReadComplete(IAsyncResult asyncResult).
MSExchangeTransport 10003 7/26/2010 2:09:57 AM 1,330
Event Details: The transport process failed during message processing with the following call stack: System.NullReferenceException: Object reference not set to an instance of an object. at AvgAntispam4Exchange2007.AvgAspamSmtpReceiveAgent.AvgAspamEndOfDataEventHandler(ReceiveMessageEventSource source, EndOfDataEventArgs args) at Microsoft.Exchange.Data.Transport.Smtp.SmtpReceiveAgent.Invoke(String eventTopic, Object source, Object e) at Microsoft.Exchange.Data.Transport.Internal.MExRuntime.Dispatcher.Invoke(MExSession session) at Microsoft.Exchange.Data.Transport.Internal.MExRuntime.MExSession.AsyncInvoke(Object state) at Microsoft.Exchange.Data.Transport.Internal.MExRuntime.MExSession.BeginInvoke(String topic, Object source, Object e, AsyncCallback callback, Object callbackState) at Microsoft.Exchange.Protocols.Smtp.MExEvents.RaiseEvent(MExSession mexSession, String eventTopic, Int32 timeout, AsyncCallback callback, Object state, Object[] contexts) at Microsoft.Exchange.Protocols.Smtp.BaseDataSmtpCommand.RaiseEODEvent(Object state) at Microsoft.Exchange.Protocols.Smtp.BaseDataSmtpCommand.OnEod(Boolean isAsync) at Microsoft.Exchange.Protocols.Smtp.BaseDataSmtpCommand.RawDataReceived(Byte[] data, Int32 offset, Int32 numBytes) at Microsoft.Exchange.Protocols.Smtp.SmtpInSession.ReadComplete(IAsyncResult asyncResult) at Microsoft.Exchange.Net.LazyAsyncResult.Complete(IntPtr userToken) at Microsoft.Exchange.Net.NetworkConnection.InvokeRecvCallback(LazyAsyncResultWithTimeout asyncResult, Object result) at Microsoft.Exchange.Net.NetworkConnection.ReadDataAvailable(IAsyncResult asyncResult) at System.Net.LazyAsyncResult.Complete(IntPtr userToken) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Net.ContextAwareResult.Complete(IntPtr userToken) at System.Net.LazyAsyncResult.ProtectedInvokeCallback(Object result, IntPtr userToken) at System.Net.Sockets.BaseOverlappedAsyncResult.CompletionPortCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped) at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)

[sc123]

That's all gibberish to me, sorry.