1.確定郵箱開了SMTP服務.
例如：從163郵箱發送到QQ郵箱
配置163郵箱
設定授權密碼
2.代碼
WebMail.SmtpServer = "smtp.163.com";
WebMail.SmtpPort = 25;
WebMail.EnableSsl = true;
WebMail.UserName = "[email protected]";
WebMail.Password = "授權密碼";
WebMail.From = "[email protected]";
WebMail.Send("[email protected]", "标題", "内容");