C#写的发送邮件小程序。支持邮件*，各邮箱地址之间请用“；”隔开。实测126、163邮箱可以成功发送邮件，其他邮箱待定。-C# to write a small program to send mail. Support mass mailing, between each email address please use separated. The measured 126, 163 mailboxes can be successfully sent messages, othe