1 m.Attach(item, gomail.Rename(fileName), gomail.SetHeader(map[string][]string{
2                 "Content-Disposition": []string{
3                     fmt.Sprintf(`attachment; filename="%s"`, mime.QEncoding.Encode("UTF-8", fileName)),
4                 },
5             })) //添加附件，处理附件名乱码问题

// Attach attaches the files to the email.

func (m *Message) Attach(filename string, settings ...FileSetting) {
    m.attachments = m.appendFile(m.attachments, filename, settings)
}

// Mandatory headers are automatically added if they are not set when sending
// the email.
func SetHeader(h map[string][]string) FileSetting {
    return func(f *file) {
        for k, v := range h {
            f.Header[k] = v
        }
    }
}