由于库对465、587端口的支持不完善，推荐使用以下示例中的第三方库 MailKit。using System;using MimeKit;using MailKit.Net.Smtp;using MailKit.Security;// This code example uses MailKit (MIT License: https://github.com/jstedfast/MailKit)class。
由于库对465、587端口的支持不完善，推荐使用以下示例中的第三方库 MailKit。using System;using MimeKit;using MailKit.Net.Smtp;using MailKit.Security;// This code example uses MailKit (MIT License: https://github.com/jstedfast/MailKit)class Program{ static void Main() { try { //控制台创建的发信地址 string fromEmail = "test@example.com"; //控制台设置的SMTP密码 string password = "your password"; string toEmail = "to@example.com"; string smtpHost = "smtp.qcloudmail.com"; int smtpPort = 465; var message = new MimeMessage(); message.From.Add(new MailboxAddress("", fromEmail)); message.To.Add(new MailboxAddress("", toEmail)); message.Subject = "Test Email with HTML Content"; message.Body = new TextPart("html") { Text = @" <html> <body> <h1 style='color:blue;'>Hello!</h1> <p>This is a <b>HTML test email</b> from <i>Tencent Cloud SES</i>.</p> <p>Visit <a href='https://cloud.tencent.com/'>this link</a> for more info.</p> </body> </html>" }; using (var client = new SmtpClient()) { client.Connect(smtpHost, smtpPort, SecureSocketOptions.SslOnConnect); client.Authenticate(fromEmail, password); client.Send(message); client.Disconnect(true); } Console.WriteLine("Email sent successfully."); } catch (Exception ex) { Console.WriteLine($"Error: {ex.Message}"); } }}