Is it a job for Thread or Process?

[A]

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Hello,
In my Python script I would like to start one function of this script 
in a different thread or process?
That function sends an email.
Can you please give me an example how I can start a new thread 
or process under Win32 systems?

 Is it better to  use a new thread  or a new process for this task?
Thank you for help.
Ladislav