[issue20482] smtplib.SMTP.sendmail: improve exception message

[Mark Lawrence]

Mark Lawrence added the comment:

I don't believe that there is much sense in implementing the proposed change.  If the stdlib was changed every time a UnicodeEncodeError was reported just to show a slightly clearer exception message, I dread to think how much extra code would be added in total.  Committing a change such as this takes core dev time which IMHO opinion could be put to better use.

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versions: +Python 3.5 -Python 3.3

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