For authentication, your username is not your email address, it's the username that Tom provided you with. It will not have an @ sign in it. Your password will also have been provided by Tom.
For authentication, use the same username and password as you used for inbound email (see above).
Your mail client will set your email address and full name as they appear on your outbound emails. If you don't set those parameters in the client, the system will provide some defaults, but they probably won't be what you expect or want. If that happens, I won't be adjusting the system defaults to meet expectations: it's your job to configure these settings in your client as you would wish them to be configured.
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