1.确保邮箱开了SMTP服务.
例如：从163邮箱发送到QQ邮箱
配置163邮箱
设置授权密码
2.代码
WebMail.SmtpServer = "smtp.163.com";
WebMail.SmtpPort = 25;
WebMail.EnableSsl = true;
WebMail.UserName = "[email protected]";
WebMail.Password = "授权密码";
WebMail.From = "[email protected]";
WebMail.Send("[email protected]", "标题", "内容");