一个在redhat下面做的邮件收发程序，可以实现文本附件发送功能。对于二进制附件或包含base64无法编码识别的字符不能正常发送。重在smtp用法-a redhat below done in the mail process, can achieve this text Annex function. For binary or annex contains base64 encoding unable to identify the characters not normal this.