为什么我在尝试通过 CS 程序发送电子邮件时连接超时

本文关键字：电子邮件 超时 连接 程序 CS 为什么 | 更新日期: 2023-09-27 18:30:18

防火墙：已关闭。我收到连接超时错误。电子邮件和密码已验证。

例外情况是：System.Net.Mail.SmtpException ：操作已超时。

我的代码

 string filename = @"C:'emailsample.htm";
        string mailbody = System.IO.File.ReadAllText(filename);
        mailbody = mailbody.Replace("##NAME##", firstname.Text);
        string to = emailid.Text;
        string from = "xxx.abc45@gmail.com";
        MailMessage message = new MailMessage(from, to);
        message.Subject = "Auto Generated Mail";
        message.Body = mailbody;
        message.BodyEncoding = Encoding.UTF8;
        message.IsBodyHtml = true;
        SmtpClient client = new SmtpClient("smtp.gmail.com", 465);
        System.Net.NetworkCredential basic = new System.Net.NetworkCredential(from, "Password");
        client.EnableSsl = true;
        client.Timeout = 20000;
        client.DeliveryMethod = SmtpDeliveryMethod.Network;
        client.UseDefaultCredentials = false;
        client.Credentials = basic;
        try
        {
            client.Send(message);
        }
        catch (Exception ex)
        {
            System.Windows.MessageBox.Show(ex.ToString());
            return;
        }

为什么我在尝试通过 CS 程序发送电子邮件时连接超时

尝试将端口修改为 587。

还要验证发件人电子邮件是否正确。

 SmtpClient client = new SmtpClient();
client.Port = 587;
client.Host = "smtp.gmail.com";
client.EnableSsl = true;
client.Timeout = 10000;
client.DeliveryMethod = SmtpDeliveryMethod.Network;
client.UseDefaultCredentials = false;
client.Credentials = new System.Net.NetworkCredential("user@gmail.com","password");
MailMessage mm = new MailMessage("donotreply@domain.com", "sendtomyemail@domain.co.uk", "test", "test");
mm.BodyEncoding = UTF8Encoding.UTF8;
mm.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
client.Send(mm);
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