My initial assumption would be that it is something else interfering with it, and not SmarterMail itself.
Do you have an antivirus program installed on this computer ? If so what is it ? if so, Is smartermail ignored (skipped) or included in the scanning ?
What is the OS version ? Is it 32 or 64 bit ?
Is this a dedicated Email server or are there other things running on it too ? If so what ?
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