c# - 通过 SMTP 发送电子邮件

Question

我的网站上有联系页面，我希望用户输入他们的姓名和电子邮件 ID（无密码）并在按钮单击时发送电子邮件。

我做了谷歌，我得到的所有解决方案都需要用户密码，

public static void SendMessage(string subject, string messageBody, string toAddress, string ccAddress, string fromAddress)
{
    MailMessage message = new MailMessage();
    SmtpClient client = new SmtpClient();

    // Set the sender's address
    message.From = new MailAddress(fromAddress);

    // Allow multiple "To" addresses to be separated by a semi-colon
    if (toAddress.Trim().Length > 0)
    {
        foreach (string addr in toAddress.Split(';'))
        {
            message.To.Add(new MailAddress(addr));
        }
    }
    // Allow multiple "Cc" addresses to be separated by a semi-colon
    if (ccAddress.Trim().Length > 0)
    {
        foreach (string addr in ccAddress.Split(';'))
        {
            message.CC.Add(new MailAddress(addr));
        }
    }
    // Set the subject and message body text
    message.Subject = subject;
    message.Body = messageBody;      

    // smtp settings
    var smtp = new System.Net.Mail.SmtpClient();
    {
        smtp.Host = "smtpHost";
        smtp.Port =portno;
        smtp.EnableSsl = true;
        smtp.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
        smtp.Credentials = new NetworkCredential("fromEmail", "fromPassword");
        smtp.Timeout = 20000;
    }

    // Send the e-mail message
    smtp.Send(message);
}

但我不想强迫用户输入密码。还有其他使用 SMTP 的解决方案吗？

我得到的错误是A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond

Answer 1

我的实用程序类中有这个功能，它就像一个魅力。

public static bool SendMail(string Email, string MailSubject, string MailBody)
    {
        bool isSent = false, isMailVIASSL = Convert.ToBoolean(ConfigurationManager.AppSettings["MailServerUseSsl"]);

        string mailHost = ConfigurationManager.AppSettings["MailServerAddress"].ToString(),
        senderAddress = ConfigurationManager.AppSettings["MailServerSenderUserName"].ToString(),
        senderPassword = ConfigurationManager.AppSettings["MailServerSenderPassword"].ToString();

        int serverPort = Convert.ToInt32(ConfigurationManager.AppSettings["MailServerPort"]);

        MailMessage msgEmail = new MailMessage(new MailAddress(senderAddress), new MailAddress(Email));
        using (msgEmail)
        {
            msgEmail.IsBodyHtml = true;
            msgEmail.BodyEncoding = System.Text.Encoding.UTF8;
            msgEmail.Subject = MailSubject;
            msgEmail.Body = MailBody;

            using (SmtpClient smtp = new SmtpClient(mailHost))
            {
                smtp.UseDefaultCredentials = false;
                smtp.EnableSsl = isMailVIASSL;
                smtp.Credentials = new NetworkCredential(senderAddress, senderPassword);
                smtp.Port = serverPort;
                try
                {
                    smtp.Send(msgEmail);
                    isSent = true;
                }
                catch (Exception ex)
                {
                    throw ex;
                }
            }
        }
        return isSent;
    }

<!-- Mail Server Settings -->
<add key="MailServerAddress" value="smtp.gmail.com" />
<add key="MailServerPort" value="25" />
<add key="MailServerSenderUserName" value="username@gmail.com" />
<add key="MailServerSenderPassword" value="password" />
<add key="MailServerUseSsl" value="True" />