We Have Mail Enable Professional 3.04 installed on windows 2003 server under plesk control panel.

I have upgraded it from mail enable version 2.38

After upgradation it started giving following error

451 Requested action aborted: error in processing

I tried a lot to resolve this issue and agian reinstalling the version 2.38 but it is still giving the same error 451.

The system is not receiving or sending any mail, however I am able to send mail using webmail but can't do any thing with outlook or any other mail client.

Any help in resolving this issue is highly appreciated.

Thanks

One more thing I forgot to add that the system is automatically creating SMTP Inbound QUEUE.