Get a network sniffer, disable tls and check what exactly gets sent to the mail server and what the server answers. If you don't have a network sniffer, you can use this one: http://www.qtcentre.org/threads/34082-NetworqDebugger
Get a network sniffer, disable tls and check what exactly gets sent to the mail server and what the server answers. If you don't have a network sniffer, you can use this one: http://www.qtcentre.org/threads/34082-NetworqDebugger
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