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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Mon, 4 May 2015 13:48:42 -0600
Subject: Re: Why from en to two times with sending email
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On Mon, May 4, 2015 at 12:59 PM, Cecil Westerhof <Cecil@decebal.nl> wrote:
> 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?

Once to construct the message headers, and once to instruct the SMTP
server where to send the message. These are not required to agree; for
instance, bcc recipients need to be supplied to the server but aren't
included in the headers.