差出人名の部分 だけ MIMEエンコードする必要がある
require 'nkf'
from = "#{NKF.nkf('-jWM', '差出人')} <user@example.com>"
#=> "=?ISO-2022-JP?B?GyRCOjk9UD9NGyhC?= <user@example.com>"
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