Why from en to two times with sending email

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From	Cecil Westerhof <Cecil@decebal.nl>
Newsgroups	comp.lang.python
Subject	Why from en to two times with sending email
Organization	Decebal Computing
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Date	Mon, 04 May 2015 20:59:33 +0200
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I want to change an old Bash script to Python. When I look at:
    https://docs.python.org/2/library/email-examples.html

Then from and to have to be used two times? Why is that?

-- 
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof

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Why from en to two times with sending email Cecil Westerhof <Cecil@decebal.nl> - 2015-05-04 20:59 +0200
  Re: Why from en to two times with sending email Ian Kelly <ian.g.kelly@gmail.com> - 2015-05-04 13:48 -0600
    Re: Why from en to two times with sending email Cecil Westerhof <Cecil@decebal.nl> - 2015-05-04 22:13 +0200

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