tmail

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def mail_data(mFile)
  file = File.open(mFile).read
  mail = TMail::Mail.parse(file)
  #p mail.to # 送信先
  #p mail.from # 送信元
  idx = 1 # ファイル名
  mail.parts.each do |m|
    if nil != m['content-disposition']
    m.base64_decode
    attach_fileNm = m['content-disposition']['filename']
    #File.open("#{CLIENTDATAPATH}/#{attach_fileNm}.#{ext(m)}", 'w') do |f|
    File.open("#{CLIENTDATAPATH}/#{attach_fileNm}", 'w') do |f|
      f.write m.body
    end
  end
  idx += 1
end

CTYPE_TO_EXT = {
'image/jpeg' => 'jpg',
'image/gif' => 'gif',
'image/png' => 'png',
'image/tiff' => 'tiff',
'text/plain' => 'txt',
'application/vnd.ms-excel' => 'csv'
}

def ext( mail )
  CTYPE_TO_EXT[mail.content_type] || 'txt'
end

Thanks for the link.
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