I did some research, and this is why Auth doesnt work:
The program is not compatible with the authentication method the remote server is using.
The remote server expects a specific sequence of commands from VWMAIL Server. VWMAIL Server is sending HELO command, then trying to use AUTH command. In some cases, AUTH command can be used only after sending the HELO command from VWMAIL Server. But your client doesn't know how to use AUTH command, so it can't authenticate.
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